Obsessed is a 2009 American psychological thriller film directed by Steve Shill and written by David Loughery. Starring Idris Elba, Beyoncé and Ali Larter alongside Bruce McGill, Jerry O'Connell and Christine Lahti. The film follows Lisa Sheridan (Larter), an office temp who develops unrequited feelings for her boss, Derek Charles (Elba), and repeatedly attempts to seduce him. Derek's wife, Sharon (Beyoncé), learns of Lisa's escalating behavior and suspects her husband is having an affair.

Plot

Derek Charles works for a finance company and lives with his wife Sharon and their two-year-old son Kyle. While he is at work, he is friendly to a temp, Lisa Sheridan. Believing Derek was flirting with her, she tries to seduce him.