Bag of Bones (2011)

Beware the lake.

Bestselling novelist Mike Noonan, unable to cope after his wife's sudden death, returns to the couple's lakeside retreat in Maine, where he becomes involved in a custody battle between a young widow and her child's enormously wealthy grandfather. Mike inexplicably receives mysterious ghostly visitations, escalating nightmares and the realization that his late wife still has something to tell him.