Commissario Brunetti has a new case. One person is missing. Two policemen, Brunetti and his wife are looking for them, asking the witnesses and looking who of the suspicios persons "dunit". The capabilities are asymmetrical. The police force can arrest, but Mrs. Brunetti is better in questioning. Witnesses are around the city venice (tiles) and must be visited by die rolls or special cards (police boat for example). Then they are questioned. The witnesses are on cards in a 2-witness-row and a 3-witness-row. As soon as a witness card row is full a suspect must be arrested and brought to the police. Those are then held in the police headquarters in a row of 3 and a row of 4. A full row means one of the suspect gets removed and he/she is the murderer...