Duncan, and his now husband Lachlan are again called to investigate a possible cryptid?a grootslang killing miners in a remote African kingdom.

But what they find is treachery, betrayal, and greed revolving around two kingdoms and two royal families.

While Duncan's friends Potts and Jamie, investigate illicit diamond mining, Duncan and Lachlan find an ally in Matthew Fanning, a Pinkerton man with secrets of his own.

But the grootslang is the least of their dangers, and they'll need to defeat human, as well as inhuman, adversaries if they are to survive.