Al Límite plot
A nighttime radio show receives a call from a serial killer in Madrid. He makes the presenter of the program a proposal. If she manages to find the woman within an hour on the basis of some clues he gives, he will not kill her. This macabre phone call also reaches Maria Ramos, who is in charge of this case on behalf of the justice system, who immediately sets up a team of experts to solve the case. However, she clashes with the radio host who, ambitious as she is, sees this as the chance of a lifetime to get to the top. Meanwhile, the killer plays an extremely sophisticated cat and mouse game.