Santos, a Collection demon from Hell, finds himself drawn to a human. He doesn't want to corrupt Erin, he simply wants her, but he doesn't understand how humans interact. As he tries to blend in, his demon partner tricks Erin into bartering her soul.
When the time comes for Erin to regain her lost soul, Santos is chosen as her debt collector. He is bound by rules, yet he finagles options. One choice will corrupt her soul forever, but the other choice could spell her death.
Caught up in a situation neither wanted, Santos and Erin form a bond with one another, but will this be enough for them to survive and find love?