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I can't remember the author or the title of this book.. I know its about these three kids who's families go on vacation to these rented houses together.. Then the three boys go into this shed and find a secret door into this room with all kinds of antique stuff.. Whenever they go into this room its like all time stops.. They also hear whispers inside this secret room.. Then at the end of the book its like all three kids r possessed and this man starts killing everyone.. If anyone can help me with either the author or title it would really help me out.. Thanks