Megan Fox plays Emma Webster, married to a controlling lawyer. On their eleventh wedding anniversary (? I wasn't about to go back to find out the exact number) he takes her to their lake house in the middle of winter, ostensibly to rekindle the romance. In the morning, she finds herself handcuffed to his corpse (hey, you learn that twenty seconds into the trailer - yeah, it's a spoiler, it's just not mine). That's bad, but it gets steadily worse.
Megan Fox puts in a good performance. Intellectually, I'd say it's a fairly good, fairly tense movie ... but somehow I really didn't care too much about the outcome. It does what it says on the tin, and if you like Megan Fox, maybe you'll like this.