Painting Tacoma

Shawn Turk flees his bible-thumping hometown girlfriend only to fall for a Christian girl named after his new city. But this girl is different - she writes her own rules, and her beliefs don't preclude adventurous sex and agnostic boyfriends. So why is Shawn walking across the Tacoma Narrows Bridge at midnight, holding a copy of The Lion, the Witch and the Wardrobe? And who was that possessed creature at his door that evening, trying to pull a foxhole conversion?