Fresh from the realization that she is a member of the Fae, Bo is approached by a strange client, Will, a real life Will O' the Wisp. The storehouse of jewels he's collected over the centuries has been stolen... by a human! While this line of work is foreign to Bo, Will offers her an irresistible payment - information about where she might have come from. As Bo gets involved in the recovery of Will's gems, she finds the shocking truth about the thief... and the weird and deadly forces that seem to also be on the trail of the jewels.

Bo and Kenzi open a private investigation office. Their first job is to find a missing student at a local college. Kenzi goes undercover in the college, Bo joins campus security to uncover what happened. Bo and Dyson's relationship goes on the rocks and another species of Fae is revealed.

When a Fury with an unfaithful spouse tries to hire Bo to kill her husband's mistress, Bo instead takes the side of the unsuspecting human woman and puts her under protection.

Bo is hired by a Dark Fae named Mayer to find out how a human managed to win a bet with him. The reward for finding out is having an Oracle reveal something of Bo's past to her. Bo solves the mystery by finding out that a Fae that can jump between human corpses, called a Hsien, managed the deed. In the end, the answers Bo seeks are not given, but she does learn one thing. Her mother is alive, and coming for Bo.

While tagging after Lauren and Bo in the Fae world, Kenzi becomes deathly ill (and incredibly grossed-out) when she inadvertently eats some toxic human soup at the home of an Aswang.

A murder-suicide leads a human household to hiring Kenzi as a Shaman. Accidentally cleansing their house, a psychosis-inducing venomous Fae spider tags along when she returns home.

Bo's freelance work earns her a lead on someone who might know something about her mother... but the trail ends at Lou Ann, a death row inmate who claims not to know anything at all. Desperate to prove otherwise, and increasingly convinced Lou Ann is innocent, Bo uses all her Fae connections to try and bust her out of jail. When she has to admit defeat, Bo's goal switches to one of personal vengeance: to find Vex, the Fae that framed Lou Ann, and make him pay.

A fun-filled Fae "high holiday" turns potentially deadly when a Banshee wail predicts the death of someone in Trick's bar to occur within the next 12 hours. After a scramble that puts Bo and Dyson on the Banshee's trail, the two learn the name of the Light Fae (Sean) who's marked for death – and his last wish is for them to help him reconcile with his Dark Fae brother. Bo has to heal the rift between the two brothers at great risk to herself, while trying to unravel and prevent the mysterious death omen hanging over Sean.

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.

When Dyson wakes up bloody and without the last eight hours of memory, he finds himself accused of murdering Ba'al, a close associate of The Morrigan's pet psychopath, Vex, and takes refuge in Trick's bar, invoking sanctuary.

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.