Rule #1: Don't tell the demons you can see them.
Rule #2: Don't let a demon think you're useful.
Rule #3: Don't ever owe a demon anything.
Aren't there exceptions to every rule? Kendra Abbot is learning the hard way that once you bend them, you can never go back. She's seen demons every day of her life, but it was never a problem until she caught the eye of Nicholas Grant. A yokai older than Jesus is a dangerous thing, and even more so when he wields the power of desire.
Whatever Nick wants, Nick gets, but Kendra has a secret weapon. There's power in knowledge, and she's determined to know her enemy.
When a single debt for a friend backfires in the worst way, and favors change hands, it's Kendra caught in the middle, forcing her to create a new rule.
Rule #4: never, ever sleep with your boss.