Annie, played by Mad Men's Caity Lotz, is reluctant to go back to the house she grew up in, the house in which her mother has just recently passed away in. To add to this trauma, her sister, Nicole disappeared shortly after their mother's death. No one seems to know where she is, though it is known that she had called her young daughter, which was the last time she was heard from.
Annie searches for clues in the disappearance of Nicole while at the same time feeling ambivalent over the death of her mother. She enlists her cousin, Liz, to keep her company for a few days in her mother's house while she copes with all that is going on. When morning comes, Liz has also disappeared, and this leaves Annie all alone in the house. Now she can't ignore the clues that have been there since she came back - lights turning on and off, objects in the house not in their previous positions, and unexplained noises. Where are they coming from? When Annie goes to the police to report her missing sister and cousin and her haunted house, the police are skeptical and don't believe a word she says. Soon enough, Annie realizes that she is not alone in the house, but who else is in the house with her?
The suspense in The Pact builds and builds throughout the movie, so you have no idea what what will happen next or how it will turn out. The acting is effective, as is the dark mood and dark tone of the film. But it is the very chilling final ten minutes of The Pact that will stop your heart and keep you on the edge of your seat.