For horror fans!

Amity by Micol Ostow
If you love quietly building horror, then this is one you should read!  Told in two voices, this is the story of two families who have lived in Amity on the Concord River in Massachussetts. Connor has been diagnosed by psychiatrists as a sociopath after several disturbing incidents at school. His family has moved into the secluded house to escape a troubling past that includes violent behavior and an obsession with his twin sister Julianne.  Nightmares begin for Connor almost immediately, and he spirals downward quickly. 
Ten years later Gwen and her family buy Amity and move there in the hopes that the quiet country will be therapeutic and restorative for Gwen, who has recently been hospitalized for mental illness. The nightmares begin soon after for both Gwen and her previously gentle and supportive brother Luke, who becomes obsessed with the mysterious boathouse on the shore of the river. 
It turns out that Amity has a dark and violent history, and perhaps a sentient existence of her own that is reaching out to the teens. 
The book jacket states that this story is based on a true crime story, but does not elaborate. I recommend this book to lovers of horror stories who appreciate quiet tension and buildup and have rather strong stomachs!  I read this one in one sitting!