The Wanting — Campbell Armstrong

A California vacation town holds a terrifying secret in this novel from the international bestselling author who “writes much better than King or Straub” (Village Voice).
 
When Max and Louise Untermeyer rent a house in the remote pine forests of Northern California, they figure it'll be a perfect escape from the city, especially for their twelve-year-old son, Denny. Their neighbors, Dick and Charlotte Summer, are an elderly couple who certainly seem nice enough. And while they positively dote on the boy, plying him with sweets and gifts, it's a shame there are no other children Denny's age to play with. Louise is beginning to wonder why, but no one in town likes to talk about it.
 
But that's not the only thing troubling Louise. A parent expects a boy of Denny's age to go through changes -- just not like this. Day by day, his innocence seems to be draining away, replaced by something unhealthy, even perverse. Now, the closer Denny gets to Mr. and Mrs. Summer, the closer he is to being lost forever in their dark secret. And anyone who comes looking for him hasn't got a prayer.
 
The international bestselling author of the Glasgow novels and the Frank Pagan series, Campbell Armstrong has won a Scottish Arts Council Award and a nomination for the Prix du Polar. Any one of his novels “belongs in the permanent collection of horror/thriller fans” (Kirkus Reviews).