While investigating a baffling sex-related murder case, Bo comes into contact with Saskia, a carefree Succubus who has much to teach her. But as they work together to find the serial killer Saskia reveals her true Dark Fae colours, which tests the limits of this newfound friendship -- and of Bo's own inner bad girl. Now feeling like a third wheel, Kenzi joins forces with Trick in a race against time to help him keep an old promise and save The Dal Riata.

Bo and Dyson go undercover as a married power couple at a swank country club to help an old friend from Kenzi's criminal past. At first they enjoy their taste of the good life – and the chance to play house. But soon the emotional pressure of the charade, and the increasing body count, push Dyson and Bo to a new level in their relationship... and prompts Dyson to give Trick an ultimatum.

It’s time for them to tell Bo all they know about her origins once and for all. But before Dyson has a chance to come clean to Bo, an unexpected arrival drops by and tries to silence him for good.

Bo finally learns the identity of her mother – and that those closest to her have been keeping secrets. No longer sure who to trust, Bo decides to track down “Mommy Dearest” alone, in order to extract the truth about her own origins once and for all. While everyone frantically searches for Bo, Dyson visits an ancient Norn, a wish-granting, tree-dwelling crone, where – in order to protect the woman he loves -- he makes a sacrifice that may change his relationship with Bo forever, as she prepares for a final face off with her deadly mother.