A witness reports a brutal, yet professional hold-up on a cash office, where heavy weapons result in a needless fatal victim. Wolfs and Eva set chase in vain, a young suspect is found murdered by his cahoots. They realize a mastermind must be abusing naive kids, and suspect an inside job. Two brothers with criminal records can barely suspend their rivalry for their mother's funeral. Romeo and Marion supervise and work out the fraternal grudge isn't based on true suspicions.
Retired Maastricht cop Swaans claims his daughter, student Julia, was murdered by her ex-lover, painter Wijnand de Jonge, whose shamelessly-exposed model she was, but it could also be suicide and she had a stalker. Farmer Gilles Boerma claims his worthless old cow Bessy was abducted by aliens 'like may others in the Low Countries'.
Een know Maastricht fashion designer was killed in her workshop, after her husband drove her to the airport for a flight to Milan. Autopsy shows she was poisoned with home-made Sarin gas. Her schizophrenic brother in law repeatedly threatened her. Meanwhile Romeo and Marion look into a domestic fight, but the abusive wife files complaints against her abused partner and Marion.
A spectacular action liberates prisoners on transport by bus to court. Among them is Wijnand de Jonge, morbid artist and serial killer, whom Romeo en Marion spot in a luxury car, but is lost by them and later Wolfs. Yet he contacts them, claiming the real killer is still around. Romeo and Marion mistrust a shepherd's complaints about a loose dog, and stumble upon a suspiciously secretive vet's tightly closed home, indeed full of criminals.
Wolfs's study mate Mart Vreeken asks Wolfs to tell his wife when he succumbed from terminal cancer. Next day his car is found abandoned at the river Maas. Wolfs contacts his wife about a possible suicide, but his car is found next day by the river. Romeo en Marion stumble upon serial thefts in a rest home, with lots of potential suspects.
Maastricht alderman Maassen is murdered. Everyone assumes it must relate to alleged bribes from a contractor whom he helped to municipal contracts, which local reporter Goossens was attempting to expose, but he has an ulterior motive and was fired. When Romeo arrests school boy Mark Meeuwsen for minor drug dealing, the knave is convinced to identify as real dealer Lenny Bastiaans, who is linked to the alderman's haughty widow. She's also involved in murky schemes to assure custody of her grandson Robbie Rutten, son of half-wit Joost, and an adulterous affair.
Wolfs and Eva are called to a jeweler being robbed and manage arrest the culprits, save one, who manages to take a girl hostage to allow his escape by airport. Gradually it becomes clear from people's past that there's more to this case then meets the eye.