Books like No Sanctuary

Rick would do anything for his girlfriend, Bert. He'd even spend his vacation in the wilderness with her, hiking the trails around Fern Lake, even though it's the last place on Earth he wants to be. But Rick would follow Bert to hell and back - which is just what he's about to do.Gillian is on vacation too, but her pastimes are decidedly weirder than Rick and Bert's. She likes to break into people's homes and live there while they're away. Too bad for her she picked the home of a serial killer - a particularly nasty one who likes to take his victims out to the wilds of Fern Lake so he can have his fun without being interrupted. Rick and Bert have no idea how wild the wilderness can be. But they're about to find out.