Who Killed Sara? - Season 1

"It Wasn't a Mistake"

A group of teenage friends are drinking alcohol and having fun while cruising along the lake during the early afternoon. Sara Guzman (Ximena Lamadrid) is seen having fun with her brother Alex Guzman (Manolo Cardona), her boyfriend and Alex's best friend Rodolfo Lazcano (Alejandro Nones), Rodolfo's brother Jose Maria "Chema" Lazcano, and Elroy. One of the friends on the boat suggests that Sara parascend above the lake, and Sara takes off on the parachute. The harness securing Sara to the parachute begins to break and Sara panics. Alex realizes Sara's distress and tries to get Rodolfo to stop the boat; however, the intoxicated Rodolfo thinks Sara wants to go faster, so he speeds up the boat instead. The harness breaks and Sara falls to the lake from a great height. The group gets Sara to the hospital in an attempt to save her life, but at the hospital, Sara is declared dead. Alex blames Rodolfo for his actions on the boat. To keep Rodolfo out of legal trouble, Rodolfo's father Cesar Lazcano (Ginés García Millán) persuades Alex to claim to the courts that it was an "accident" that was his fault, but Alex doesn’t realize that this will lead to a 30-year prison sentence.

The episode continues almost 18 years after Alex Guzman’s imprisonment when he is released from jail, and his ultimate revenge plot against the Lazcano family begins. In the present day, the Lazacanos gather at a family owned and operated casino to celebrate Rodolfo's promotion within the family business. Alex hacks into the casino's TV displays and runs a video of himself accusing the Lazcano family of murder and vowing revenge.

"Bad People"

After the incident that happened at the casino, Cesar Lazcano’s decision of whether or not to pursue taking down Alex Guzman causes problems immediately. The youngest Lazcano child, Elisa (Carolina Miranda), is seen perturbed over the revelations about her family and starts to investigate. In a flashback of when Sara Guzman passed away, a young Elisa witnesses an argument between Rodolfo and Chema over Alex's fate. As Elisa follows Rodolfo to the house where Alex lives, an SUV follows right after, and two men emerge from the SUV and begin to shoot the house. The two men enter the house and knock Alex out. Cesar instructs his henchmen to leave Alex alive, with the shooting and beating serving as a warning not to pursue further action against the Lazcano family. After the incident, Elisa enters the house, only to find Alex on the floor bleeding, and sees a plethora of photos of her own family.

"Love, Sara"

This episode starts with a flashback where Alex is at a party with his sister Sara and their friends. During the party, Sara sees Chema hugging Alex, hinting that Sara may know that Chema is gay. It then cuts back to the present day where Elisa is at Alex’s house and they are drinking. Elisa is fishing for answers from Alex to see why he is after her family, reminding him that he can trust her, as Alex does not know that she is also part of the family. While Alex is distracted, Elisa looks around the house for clues. She sees that he hacked her mother's phone to see and hear whatever is going on. The scene quickly changes to Cesar at his casino. He begins walking to a lower part of the casino where it turns out that there is a hidden brothel. Elisa goes to her mother’s house and takes her mother’s phone without her knowing and puts it in a vase filled with water. The scene changes to Bruno in school. While he is in class, everyone, including him, receives a photo of his family with "murderers" written on it. While Alex is at home, he receives another text from the person known as "Diana the Huntress", saying that Rodolfo is not the killer. Alex, who is still suspicious of this person, asks for proof, and the person replies that they were there and sends a picture of a rusted knife, the same knife that Alex gave Chema 18 years ago. While Mariana is at home, she receives a package that has Chema’s knife that she threw in the water 18 years ago. Alex finds Chema, chases him down, and demands that he give him the tapes that he recorded 18 years ago when Sara died. Chema also has a flashback to when Sara finds out that Chema is gay. While Alex is out, Elisa sneaks back into his house to search for more clues. When Alex gets home and sees her, she explains that she just wanted to see him, and the two have sex. Afterwards, Alex reveals to Elisa that he knows her true identity.

"Life Insurance"

In a flashback, young Alex wakes up in a prison hospital bed after being beat up by other prisoners. Another prisoner is by his side and states he will be his fairy godmother. Young Alex asks his lawyer why he’s still in prison, and that he needs to go back with his mother. The lawyer regretfully informs Alex that his mother has passed away. At the casino, Elroy is looking worried as he admires a picture of Sara. In a flashback, Cesar shows interest in Sara, and then it shows young Rodolfo and Sara having sex in the back of a car. In the present day, Alex gets saved by Elisa in a narrow encounter with the police and the two go home to have sex. The next morning, Alex starts photocopying Sara's diary and sends Elroy a note with Sara’s handwriting. Chema and Lorenzo ask Clara if she’s interested in becoming their surrogate mother. Clara excitedly accepts. At the club, Elroy struggles with the fact that he killed the accountant and his hallucinations of Sara. Rodolfo and Sofia argue because she can’t get pregnant and she thinks Rodolfo has a problem. Mariana threatens Elroy at the casino after finding out that he told Elisa about Sara’s death. That night Alex and Elisa arrive at the casino party and break into César’s office to copy his computer files. Bruno looks for Imara and goes to the casino basement. At the casino party, the lights turn off and images of César hunting endangered animals are projected in front of his guests. Suddenly, Elroy shows up with a gun and points it at César but the weapon is turned on himself and he is shot.

"Hunting"

In two different flashbacks, Elroy sees Sara having sex with Rodolfo and Cesar. In a different flashback, Elroy leaves his alcoholic father in a burning house and ends up at an orphanage where he meets Mariana. In the present, the Lazcano family is at the casino for a party. Clara goes to the restroom and witnesses Cesar and Sofia engaging in sex. Elroy goes to his office to get a gun and overhears Alex and Elisa in Cesar's office. He plans to shoot Alex but is stopped when he has a hallucination of Sara calling him a coward. Bruno finds Imara in the casino basement but she is unresponsive. Sergio encounters Alex and immediately calls security. Back at the party, Cesar is trying to stop the media from recording or taking pictures of the projected pictures of his hunting trophies. Elroy shows up with the gun and points it to himself. A gunshot goes off as Elroy gets shot by a security guard. In a flashback, Elroy, as a child, crashes his bike into a ladder his mother was standing on, causing his mother to fall to her death. Alex and Cesar see each other and the chase begins as Alex runs to the brothel entrance with Cesar right behind him. Alex comes running out the back door and Chema and Rodolfo tell him they are there to help him. They hurry into the van and escape to the lake house where Sara died. Cesar and his security team arrive at Alex's home and start shooting the place up, destroying his equipment.

"Fear and Guilt"

Rodolfo, Elisa, Chema, and Alex are at the lake house. Back at the casino, Sergio mentions that Alex must have taken confidential information and suggests that Cesar make a compromise with him. Elisa questions Alex on how far he's going to go to destroy her family, as he has already damaged her father’s reputation. They then proceed to have sex, when Alex has a delusion of Sara looking at him while he's being kissed by Elisa. Mariana visits Elroy at the hospital. In a flashback, the prisoner who said he was Alex's fairy godmother shows him a picture of his daughter, Flor, and explains how Cesar killed her. Sergio goes to the basement, physically abuses Imara, and records it. Chema arrives at the lobby of the laboratory and asks Lorenzo for forgiveness. Rodolfo sees Bruno at the casino and asks what he’s doing there. Bruno ignores him and continues making his way to the basement. Rodolfo follows him and is shocked to see that it’s a brothel. Clara reveals to Chema that Sofia is having an affair with Cesar.

"Where Dreams Become Reality"

In flashbacks, Sara tells Cesar that she’s pregnant and discovers a disturbing video of Sergio. Sara manages to escape with the video before Sergio can do anything. Jose Maria and Lorenzo take the next step in the process of in vitro fertilization. Elisa goes to the hospital to find out what Elroy knows about Flor. In another flashback, Sara tells Rodolfo that she’s pregnant. Sofia tells Cesar that she’s pregnant. Rodolpho confronts Cesar about the casino basement. Moncho, Clara's toxic and obsessive ex-boyfriend, comes to her apartment and attempts to get her to return to him, but she refuses. Lorenzo and Jose Maria announce that they’re going to have a baby, which leads to a family argument. Jose Maria reveals that Sofia is cheating on Rodolfo with César.

"Watch the World Burn"

Sergio tries to persuade Alex into joining forces to take down Cesar. In a dream, Elisa recalls a disturbing memory. Bruno goes to the casino’s basement to look for Imara. Clara continues the in vitro fertilization process with Jose Maria and Lorenzo. Moncho follows Lorenzo and threatens him at his work. Sofia goes to Cesar for help, but he refuses. Rodolfo and Alex meet to discuss Sara's death and Alex lets Rodolfo stay with him. A casino worker approaches Elisa about Imara’s death. Elisa confronts Alex about the secrets she’s keeping from him. Marifer, Sara’s best friend, gives Alex a video Sara left.

"Two Graves"

In a flashback, Elroy tells Mariana that Sara is pregnant, but the baby isn’t Rodolfo’s. Alex, Marifer, Rodolfo, and Elisa watch the video Sara left, which shows Flor being tortured when she was captive. Elisa goes to the hospital to visit Elroy and ask him what he knows about the deaths of Flor and Imara, but is interrupted by Mariana's arrival. The identity of Diana Casadora is revealed to be Marifer, Sara's best friend. Rodolfo kicks Sofia out of the house and reveals he is sterile after a vasectomy he had done. Lorenzo, frustrated over everything going on with Jose María's family and learning that Clara's ex-boyfriend Moncho is stalking her, breaks up with Jose María and leaves. Elisa confronts Cesar about the casino basement and Sara’s death. In another flashback, the events surrounding Sara’s death start to come together. It is revealed that after her husband cheated with Sara, Mariana asked Elroy to cut the harness of the parachute. Alex finds Sara's diary and discovers that she was apparently insane, which leads him to find a skeleton buried in his backyard.