At a funeral in a stylish cemetery, Hinnerk Feldmann discovers a dead woman under the coffin of the deceased. The dead man is called Maria Fröbe. She was suffocated the night before. Maria was a singer in the church choir. After the choir rehearsal, she cycled home with Malte Arent. He is an employee of Maria's husband Jochen Fröbe, who runs a thatched roofing shop. Jochen assumes that she is a painter, lover and murderer of Maria. But Malte exonerated the investigations of the Sylt commissioners. Commissioner Sievers finds out that the victim did not go home, but instead went back to church to meet Pastor Tillich. Tillich does not deny the weekly meetings, but he has had no relationship with Maria.
But when Tillich is more and more suspected of being a crime, he breaks his vow of silence and reveals that an unknown person confessed to him the murder of Maria. If Tillich tells the truth, he is in danger. Commissioner Sievers instructed Hinnerk and Ina to watch the pastor. When Jochen Fröbe finds his wife's love letters to Pastor Tillich, he enters the church. Can Ina, who is now active as a singer in the choir, convict the real perpetrator?