The obsidian blade
(Book)

The first time his father disappeared, Tucker Feye had just turned thirteen. The Reverend Feye simply climbed on the roof to fix a shingle, let out a scream, and vanished, only to walk up the driveway an hour later, looking older and worn, with a strange girl named Lahlia in tow. In the months that followed, Tucker watched his father grow distant and his once loving mother slide into madness. But then both of his parents disappear.