|Idris Elba||Derek Charles|
|Beyoncé Knowles||Sharon Charles|
|Ali Larter||Lisa Sheridan|
|Christine Lahti||Monica Reyes|
|Bruce McGill||Joe Gage|
Things couldn't be better for Derek Charles . He's just received a big promotion at work, and has a wonderful marriage with his beautiful wife, Sharon . However, into this idyllic world steps Lisa, a temporary worker at Derek's office. Lisa begins to stalk Derek, jeopardizing all he holds dear.