Nightshade

Matthew Moore is fifteen and, on the surface, has everything going his way. That changes when a mysterious fire leaves his grandmother with nowhere to live but his family's home. She is determined to recreate the room of Cynthia, the child she loved most, who died more than ten years earlier, and she sets about rebuilding it inside the house.

Matt begins to notice strange changes. Terrifying nightmares visit him after dark, and by morning the scent of Cynthia's perfume seems to hang in his room. As his grandmother works to pull his parents apart, Matt shifts from an outgoing, sociable boy into a withdrawn and angry loner.

A sudden tragedy tears the household apart, and a dark presence from the past begins to stir, moving toward Matt with a menace that seems to have a will of its own. The novel is by John Saul, an American author known for horror and suspense fiction.