Devastated by a family tragedy, Sara and her son, Tom, seek a new start at Jagged Shore Cliff, a remote cliff in the United Kingdom. However, their worst fear is waiting for them there. In their new and mysterious home, a dusty cabinet holds Baptiste, an unsettling doll accompanied by an ominous warning: “Never release this from its glass prison.” What ought to have been a shelter becomes the scene of a nightmare that defies all logic, putting their sanity and desire to survive to the test.