Big Mommas: Like Father, Like Son (PG-13) An FBI agent (Martin Lawrence) and his stepson go undercover at an all-girls' school after witnessing a murder.Cedar Rapids (R) A mild-mannered insurance salesman (Ed Helms) has a wild time at a convention. With John C. Reilly and Anne Heche.

The Housemaid (not rated) A man's affair with the family maid leads to dark consequences in this erotic thriller from South Korea.

I Am Number Four (PG-13) An extraordinary teenager masks his true identity to elude a deadly enemy.

Unknown (PG-13) A man (Liam Neeson) awakens from a coma to discover that someone has stolen his identity.