Lena Odenthal gets a call: a witness wants to testify something important about a murder, but when Lena Odenthal arrives at the meeting point, the witness is dead, her identity card identifies her as Michaela Bäuerle. The case she wanted to testify about was twelve years ago, the murderer confessed and has served his sentence. So what else did Michaela Bäuerle want to say? Lena Odenthal and Mario Kopper go in search of clues in the past and come across a strange connection: Michaela Bäuerle has been missing since 1997. What do the two cases have to do with each other?