The "Naked Tankers of Huttrop" are a group of motorists who are protesting against constantly rising gasoline prices by filling up their tanks naked. The protest is well received by the public, but less so by the oil companies.

Herbert Kupp is found dead in the church of the parish of St. Betram. During the investigation, Mick meets his old friend Bodo Romanski again after almost 20 years and is astonished: Bodo, formerly a petty criminal, is now the parish priest. However, the joy of their reunion is quickly dampened when Herbert's widow, Anneliese Kupp, draws the investigators' attention to a dispute between her husband and Bodo...