Percy Jackson and the Titan's Curse
Rick Riordan
Miramax

It's the last Friday before the winter holidays but Percy Jackson isn't at school, he's battling the fearsome Manticore (half human, half lion), which in itself isn't ideal...but with Annabeth missing and the goddess of the hunt held captive, things get a whole lot more serious...

Also in the same series:
Percy Jackson and the Lightning Thief
Percy Jackson and the Sea of Monsters
Percy Jackson and the Battle of the Labyrinth
Percy Jackson and the Last Olympian
Percy Jackson: The Demigod Files