In the Zurich North waste incineration plant, the body of a young woman is found in a car roof box. District Attorney Regina Flint and Detective Commissioner Bruno Cavalli are on the trail of traffickers in the Zurich red-light district who will stop at nothing. The more tangled the clues become, the clearer the motive: money. Until a second murder occurs, which has much to do with the case but nothing to do with money. At the same time, Flint and Cavalli struggle against their love, which has already once led them to the brink in the past.