Now Showing: Broken City

(CNN) - Two missing girls are rescued, but that doesn't mean a happy ending. An iconic action star returns to the big screen, and a drama about revenge against a corrupt politician.

Here's a preview of this week's new releases.

"Mama" is a thriller about the terrifying happenings that occur when two young sisters lose their parents and disappear on the same day. Years later they are found, but that's just where the story begins.

Arnold is back. In "The Last Stand," Schwarzenegger plays a lawman who has left Los Angeles for a more peaceful, small town existence. That's all shattered when a drug kingpin escapes federal custody.

In "Broken City," Mark Wahlberg plays an ex-officer looking for revenge against the may who double-crossed him. Unfortunately that is the town's mayor and most powerful figure, played by Russell Crowe.