Beyoncé Knowles stars in this 2009 thriller alongside Idris Elba and Ali Lartner. Derek (Elba) is a successful investment banker who is happily married to his wife Sharon (Knowles). However he's confronted with an uncomfortable situation at work when a sultry woman named Lisa (Larter) is hired at his office. Very attractive and equally determined, this new employee becomes obsessed with Derek to the point that he cannot escape her.