Terrance O'Hara is a priest with a dark past and a secret. By day, he preaches the good book. By night, he hunts the creatures that stalk the innocent. Haunted by past actions and family sins, he vows to hunt down the demon lord who wronged his ancestors. Teaming up with the unlikely allies of Lucy, a succubus and lawyer by trade, and Mary, a day-walking vampire, the trio goes on a journey from Boston to New York, quickly falling into a rabbit hole of demonic conspiracy. Can Terry outrun fate and overcome his family curse? Or will Lord Barbatos claim another soul?