A car, sunk in a Cologne quarry – with a body in the trunk: detectives Max Ballauf and Freddy Schenk are investigating. The identity of the murder victim is quickly clarified. It is about the young car enthusiast and traffic rowdy Florin Baciu. He recently became a partner in Matthes Grevel's tire trading company. He brought significantly higher sales to the formerly tranquil family business - thanks to excellent contacts in the "racing scene". That's why he wasn't popular with his colleagues: It's an open secret that his business dealings weren't always completely legal. Then the forensics department makes an important discovery: Baciu was apparently shot in his own assembly hall. The father of the family, Matthes Grevel, is targeted by the inspectors.