Television actress Pepa Marcos is depressed because her boyfriend Iván has left her. They are voice actors who dub foreign films, notably Johnny Guitar with Joan Crawford and Sterling Hayden. Iván's sweet-talking voice is the same one he uses in his work. About to leave on a trip, he has asked Pepa to pack his things in a suitcase he will pick up later.
Pepa returns home to find her answering machine filled with frantic messages from her friend, Candela; she rips out the phone and throws it out the window onto the balcony. Candela arrives; before she can explain her situation, Carlos (Iván's son with Lucía, his previous lover) arrives with his snobbish fiancée Marisa. They are apartment-hunting, and have chosen Pepa's penthouse to tour. Carlos and Pepa figure out each other's relationship to Iván; Pepa wants to know where Iván is, but Carlos does not know. Candela tries to kill herself by jumping off the balcony.
A bored Marisa decides to drink gazpacho from the refrigerator, unaware that it has been spiked with sleeping pills. Candela explains that she had an affair with an Arab man who later visited her with some friends. Unbeknownst to her, they were a Shiite terrorist cell. When the terrorists left, Candela fled to Pepa's place; she fears that the police are after her. Pepa goes to see a lawyer recommended by Carlos.
The lawyer, Paulina, behaves strangely and refuses to help Pepa; she has plane tickets to Stockholm. Candela tells Carlos that the Shiites plan to hijack a flight to Stockholm that evening and divert it to Beirut, where they have a friend who was arrested. Carlos fixes the phone, calls the police, hangs up before (he believes) they can trace the call, and kisses Candela. Pepa returns; Lucía calls and says that she is coming over to confront her about Iván. Carlos says that Lucía has recently been released from a mental hospital. Pepa, tired of Iván, throws his suitcase out (barely missing him); he leaves Pepa a message.
Pepa returns to her apartment and hears Carlos playing Lola Beltrán's "Soy infeliz". She throws the record out the window, and it hits Paulina. Pepa hears Iván's message, rips out the phone and throws the answering machine out of the window. Lucía arrives with the telephone repairman and the police, who traced Carlos' call. Candela panics, but Carlos serves the spiked gazpacho. The policemen and repairman are knocked out, and Carlos and Candela fall asleep on the sofa; Lucía aims a policeman's gun at Pepa, who figures out that Iván is going to Stockholm with Paulina and their flight is the one the terrorists are planning to hijack. Lucía says that she faked being sane when she heard Iván's voice dubbed on a foreign film. She throws the gazpacho in Pepa's face, and rushes to the airport to kill Iván.
Pepa chases her in a cab with her neighbour, Ana. At the airport, Lucía sees Iván and Paulina at security and aims her gun at them. Pepa thwarts the murder attempt by rolling a luggage cart at Lucía, before fainting. As the police arrest Lucía, Iván rushes to Pepa's aid and apologises for the way he has been treating her, offering to talk things out with her. Pepa, however, declares it is now too late and leaves. She returns to her home, which is a mess. Pepa sits on her balcony, where Marisa has just awakened. The women chat, sharing a moment of tranquility, and Pepa finally reveals what she wanted to tell Iván: she is pregnant.
