The young wife of a millionaire hears some terrible news on the television. There has been a train accident near her house. It’s such a serious accident that it will be impossible to identify some of the victims. This is a terrible catastrophe for the city but it will mean something completely different for her.

Eva, a young police department thefts of the Catalan police and eternal aspiring homicide department, is recruited to catch a serial murderer who is dedicated to killing older women. The young agent, single mother of a six year old, have to combine hunting the murderer with her maternal obligations.