Lydia comes back to her birthplace from the USA after 30 years just two weeks before her younger half-sister doctor Eva's marriage to teacher Christian. For years Eva has been looking for her whom she had never met before. It is said that she was mentally ill at the age of 14 and moved to the United States following a suicide attempt and subsequent psychiatric treatment. Lydia accuses Eva's fiancé Christian of raping her and shows him to the police. Christian denies everything and calls an Interrail trip with Lydia's stepbrother Max as alibi. After some time his body is found. It looks like a suicide, which is later confirmed by the requested by Eva autopsy. Eva accuses Lydia of having killed Christian through her allegations.