The Midnighters band together to stop an ancient succubus who seduces and devours men, and Olivia discovers an unwelcome connection to her past while carrying out a hit.

A bounty hunter from Joe's past arrives in Midnight to punish him for leaving the angelic fold. Manfred takes charge with a plan to lead Fiji, Olivia, Bobo and Lem in an effort to stop this dangerous, nearly immortal foe from killing Joe and Chuy, as well as destroying Midnight. Meanwhile, Creek struggles to recover from her family tragedy. Elsewhere, the Rev refuses to compromise the safety of his neighbors and it costs him dearly.