The student is dead. The night before he had been arrested for being drunk in public and put in a cell to sleep it off. This morning he is found dead. Alex Delzen was not drunk, however. He has been poisoned. Murder! Vledder, DeKok's ubiquitous assistant breathes a little easier when DeKok returns from his fishing vacation. Vledder needs the help of his old mentor. A flurry of interrogations results in unexpected twists. Finally, DeKok, in his inimitable manner, arranges a dramatic confrontation in the old, renowned police station at Warmoes Street.