Statistician Riona Dade knows all about probabilities. Still, even she'd tell you the chances of discovering you’re a witch, being appointed to the demon-slaying trio known as the Pure Souls, and finding yourself sinfully attracted to a catholic priest who uses amen and other four-lettered words with equal enthusiasm are pretty slim. Also learning your ex was once Hell’s first-round draft pick, and realizing you're a prize catch for Satan’s soul-damning quota leaves a girl feeling like she just won the lottery while being struck by lightning while riding a unicorn across Atlantis. Trying to keep her mind off role playing the Thornbirds with Father Angeletti, Riona leads the Pure Souls against a maniacal menagerie of Mephistopheles’s minions plaguing greater Boston. Giving in to lust is a direct flight to damnation for both her and the priest, leading Riona to distract herself by striking up a romance with her new, foxy neighbor, Lucy. But she can't shake her attraction to Marcello, and as the tension between them grows thicker than a lumberjack’s beard, temptation may become too difficult to resist. How long can they deny the pull growing between them, knowing there will be Hell to pay?