In sleepy Flemish small town Vredegem (Dutch for 'peaceville'), the brothers Thomas and Matthias Dewitt risk having to close down their inherited insurance agency, which ails since their father's death. Honoring the fat life insurance of Jean-Claude Delcorps would surely sink them, so they're determined to contest it and investigate his death. The widow and especially her four sisters, who all hated their brother in law, are a sanctimonious cesspit of secrets, including jean-Paul's fatally staged car accident. Asian Gang Wang also attends the funeral vindictively.

The brothers Dewit continue their investigation, wondering about the earlier fire claim, while Mathias even dates one of the suspect sisters. Indeed, the Goethals girls remember how Eva first took charge of an attempt to eliminate Jean-Claude, merely on account of inappropriate behavior concerning a company quiz, while they and even his daughter conspired shamelessly against him to ruin his Ardennes charity weekend. The girls however failed to kill him, only the chalet perished in their arson attempt.

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.

The brothers continue their investigation by questioning youngest sister (Re)Bekka, who obviously lies and realizes only now that she hasn't been dating an undertaker but Mathias. She joined the murder sorority after Jean-Claude objected to a flippant promise by his wife to grant Becca a private loan for her business project, which has already been notarized although nobody even consulted him. Their next murder attempt, electrocution in bath, went wrong due to childish Becca and accidentally killed an old neighbor, Alfons. After a prank war got out of hand, ...

The bothers move on, questioning even more hostile, one-eyed sister Birgit. She remembered how Jean-Claude's mean hatred for his daughter's kitten, which he ended up killing semi-accidentally, motivated a new attempt on his life; The sisters, who felt little guilt for their failed electrocution ending sickly senior neighbor Fons's life, decide on replacing the usual quiet annual family outing with a paint-ball initiation. Birgit practiced to become deadly accurate with frozen ammunition, but Jean-Claude's helmet number six gets mixed up with an innocent friendly ...

Thomas Dewitt finally obtains the autopsy, which strengthens his murder suspicion. Brother Mathias however almost prefers to believe in an accident, for his lover's sake. A few months earlier, Jean-Claude Delcorps succeeded in eliminating Eva as rival for a promotion and made another attempt to inform nurse Wouter Cox of his wife's adultery. The sisters planned another murder attempt, using a rape drug to stage a hanging, but the garage rod he's suspended on bent and triggered the door opening mechanism, so neighbor Valère Bols saved his life.