The brothers DeWit continue their insurance fraud thesis investigation with another sister, nurse Veerle, but leave none the wiser. Yet she too had a motive since Jean-Claude discovered her adultery and threatened to inform her unsuspecting husband, paramedic Wout. She sanctimoniously refused to join the failed arsonist sisters' next plan, poisoning, but eagerly advises against mushrooms, coming up with a non-suspicious hospital drug. Yet the attempt on Jean-Claude's life on his monthly liver dinner day fails when the dog eats what no human house-mate ever touches.