Ursula Gothe (Christine Neubauer) is happily married and loves her little boy Helmut (Jannis Michel) more than anything else in the world. Her husband Dr. Richard Gothe (Oliver Stritzel) is just about to be appointed director of his company, so the material deprivation they suffered during the Second World War is in the past of his family. Ursula’s life seems perfect, but then her sad past catches up with her all of a sudden. One day it while looking through the newspaper she catches sight of the picture: a little girl who was tragically separated from her mother during the war when they were both refugees and has been living in a children's home ever since. Overwhelmed by joy as well as pain, Ursula realises that “Lost Child 312” is none other than her long-lost daughter Martina (Janina Fautz). Ursula now finds herself torn between the deep need to reclaim her daughter and the fear that by admitting to an illegitimate child she may be whisking her own marriage -- because her husband Richard knows nothing about Martina. And now, while she is trapped in this terrible dilemma, Achim Lenau (Timothy Peach) suddenly enters her life again: he is Martina's father and was the love of Ursula's life. She had always believed that he died during the war. And now Ursula is faced with the most difficult decision she has ever encountered.