The Return by Rachel Harrison

Three friends gather at the funeral of their friend who disappeared on a hike. They have waited for some news for two years but then with no warning she reappears, not knowing anything of where she has been for all that time. Thrilled that she is back they go on a trip to a remote hotel in the mountains to reconnect. The hotel is creepy, their friend Julie is creepy and then the weird stuff starts happening. This is THE EXORCIST meets THE SHINING. Scary, gory and one I wouldn't recommend reading on a vacation to the Adirondacks.