Thriller starring Idris Elba, Ali Larter & Beyonce Knowles. Derek Charles (Elba), a successful asset manager who has just received a huge promotion, is blissfully happy in his career & his marriage to the beautiful Sharon (Beyuonce Knowles). But when new office temp Lisa (Ali Larter) becomes obsessed with Derek & starts stalking him, all the things he's worked so hard for are placed in jeopardy