How do you follow up a movie like "Frank," a quirky musical comedy about the lead singer of an avant garde band who has spent years wearing a large papier-mâché head? In Lenny Abrahamson's case, you direct "Room," a tender yet harrowing story about a mother and her young son held in captivity for years by a sexual predator.

The two films perhaps aren't as different as that brief synopsis suggests. Irish filmmaker Abrahamson has often told stories about outsiders with a different...

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