Alex removed it from the key ring on a whim, but now she's obsessed with finding the lock where it fits. Visiting the dead man's house, her desire to find a home for the key becomes entwined with the odd behavior of the household staff. Alex soon realizes they're all watching her. But despite wondering how much they really know about her relationship with the dead man, she keeps searching the house. As each room yields more secrets, she's drawn deeper into the lives of its occupants. She never planned it this way, but someone will have to die if she's to escape unharmed.