A murder case leads Mick into the world of modern treasure hunting. Moritz Weber, founder of a geocaching club in Essen, is found dead in the woods next to his "treasure," a small Tupperware container—mysterious coordinates on his arm, a tiny plastic toy figure in his esophagus. The trail obviously leads to the "Treasure Hunters" and their members. The investigators have no choice but to go treasure hunting themselves...

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.