Because of the Cats (Felony & Mayhem Mysteries) (Inspector Van Der Valk Mysteries)

Bloemendaal aan Zee, that smugly prosperous little seaside town, has more television sets per capita than anywhere else in Holland. Its houses are uniformly tidy and sparkling clean. Even its drunks are polite. But there's something very wrong with the kids. The most teenagers have formed a gang that is preying, with increasing viciousness, on nearby Amsterdam - Inspector Van der Valk's patch. Van der Valk has no love for chilly, yuppified Bloemendaal. But in his curiosity is as voracious as his appetite for good food. And while his colleagues just want the attacks stopped, Van der Valk can't help asking what it is about the town that has turned Bloemendaal's children into monsters. NO CATS ARE HARMED ANYWHERE IN THE BOOK.