In 1920s Madrid, four women at the National Telephone Company ring in revolution as they deal with romance, envy and the modern workplace.
Lidia is used to being a thief, but now she must steal in order to save her life. Different hopes propel each of the women into the workplace.
Francisco offers Lidia a deal. Marga worries about what she saw at the party. Carlota's father interferes with her life.
The police are called in when Lidia's identity is questioned. Francisco's wife is suspicious and asks Carolina for help.
Marga makes a lunch date with Pablo. Ángeles learns more about Mario's infidelity. Carlota's fantasies surprise her.
Carolina threatens to reveal who Lidia really is. Miguel tells Carlota she must decide about their relationship. Everything changes for Ángeles.
Lidia helps Ángeles plan her escape. Carlota works to get Sara released from jail. Carlos fights with his father.
The Cifuentes family mourns their loss. Lidia decides she should be honest with Carlos about her identity.