La importancia de tu nombre

Elena Maldonado, a prestigious psychologist from the Salamanca district, receives a message in which someone assures that she is going to murder one of her patients and that she will have to decide which one should die and how. At first she seems like a bad joke, but she soon discovers that her anonymous puppeteer knows all her secrets and that if she doesn't follow the rules of the game, her daughter will be in grave danger. The good news is that Elena knows how people's minds work. The bad news is that her stalker's cruelty seems to be totally inhuman. Who is she and why does she hate her so much? Since when does she accompany her? Is she sharing her day to day with a sadistic murderer without knowing it?