At the beginning of the movie, Emma is cutting things off with Tom, the guy with whom she's been having an affair. He wants to meet one last time, but Emma says no - it's her anniversary, and Mark, her husband, has plans.
Things are tense between Mark and Emma, but she plays along and tries to look like she's enjoying their anniversary dinner. Then he takes her to a secluded lake house where they once spent happier times. It looks like he's set up a romantic evening, until Emma wakes up the next morning and finds herself handcuffed to him. Seconds after that discovery, Mark shoots himself in the head. Emma somehow has to break free from her husband and deal with the many traps and obstacles he's prepared for her.
