I just finished a creepy, weird book that was impossible to put down. I highly recommend

Miss Peregrine's Home for Peculiar Children by Ransom Riggs. His grandfather has told him fantastical stories all his life growing up, but it is not until his gramp dies, and everyone thinks he's lost his marbles that he begins to investigate what just might be real. He travels to an island to discover his grandfather's past and his possible future.