Three crimes happen in one night on the large construction site of the new trade fair center in Stuttgart: the multi-storey car park above the motorway is sprayed with a sprayer, valuable construction machinery is stolen and the crane operator Jochen Heeb bleeds to death on his crane after being injured by two shots. Stefan Ortlieb, a militant opponent of the trade fair, who was badly betrayed and financially cheated by Heeb in connection with the land sales for the trade fair, falls into Bienzle's sights. It turns out that he was the sprayer on the construction site that night. The murder weapon, which is quickly found, belongs to Milan Popow, one of the men from the security company SSF on duty that night. He denies having anything to do with Heeb's death, but he knew him well and had recently had a serious falling out with him.
Even his superior, Paul Rapp, who thinks highly of him, cannot allay the suspicion against him . Bienzle tries to find out more about Milan's brother Tom and discovers that there must be a connection between the murder and the thefts. Although this puts the events of the night in a new light, it makes the suspicion of Milan Popow rather greater. His wife, Kathi, who runs a laundry, fears that loyalty to his brother has drawn him into something he can no longer control. Just as Bienzle is finally able to convict the murderer, he eludes the police and tries to destroy evidence of his guilt in the Popows' laundry.
Hannelore, who is about to pick up a blouse, involuntarily witnesses the unmasking of the perpetrator and is kidnapped by him to ensure his escape. From then on, Bienzle was in a state of excitement. The perpetrator has nothing left to lose and Bienzle has to fear that he will never see his Hannelore again.