Answer
Atom Egoyan's biggest commercial success is the 2009 psychological thriller film Chloe, starring Julianne Moore, Liam Neeson, and Amanda Seyfried. The film follows a bored housewife who hires a call girl to seduce her husband in order to test his fidelity. Chloe was a critical and commercial success, grossing over $92 million worldwide against a production budget of $15 million.