Theresa is an orpham and she has spent all her life moving from one centre to another. Now she got a job in other city, during the journey she makes a new friend, an Argentinien girl that goes to live with her unkown grandmother and 4 unknows brother in Spain. Suddenly, the train derails and after that everybody in the hospital think that she is the Argentinian girl and her sweet grandmother come to bring her home. Should she go ahead or tell the truth? she become a new member of the family, but her conscience doesn´t feel so good.