The color of darkness

Summary/Review: "Danny thinks he's left magic and mystery behind, but Sammael, a creature of terrible imagination, refuses to let him go. A strange new girl, Cath, enters Danny's world, bringing with her a message: Danny's cousin Tom has sold his soul to Sammael. It's up to Danny and Cath to find Tom and stop Sammael, who seeks to destroy humankind once and for all"--