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 Dyson team up to track down a stolen Mongolian Death Worm on behalf of Dyson's old wolf pack mate. When things get complicated, Dyson finds himself reliving his medieval days – tormented by the hard choices he once had to make, and fighting in the present not to repeat past mistakes.

Concerned that Bo’s plan is too risky, Trick offers Bo one more weapon for her own, and everyone else’s, safety. Bo must lead her friends into battle ahead of schedule when her hand is forced by their enemy. A revelation from Dyson provides Bo with ammunition, but another’s deceit threatens the mission. Prophecies come true… but at what cost?

Dyson seeks out an elemental Fae to rescue someone he loves. Kenzi’s stuck on babysitting duty – but her unlikely charge might be the key to cracking the case.