Clara Burrowes owes the Alliance of Silver and Steam her life. When the battle between Earth and Hell broke out, she was saved from death by her worst nightmare, a hunter. In repayment, she works as both a hunter and an inventor's assistant. It didn't take long before she grew to love her work and even humans. Hugo Clark was assistant to Nikola Tesla when they traveled to British court, and the King made him an offer to see technology beyond his wildest imagination. Without hesitation, Hugo abandoned his work with Tesla and joined the Alliance. Demons didn't frighten him if he could work with such amazing tools. When Hugo and Clara met attraction stemmed from more than just her Succubus talents. The pair worked as well together in the labs as they did between the sheets. Wishing to find a way to illuminate the Christmas holiday, their tinkering led to danger. An electrical current wakes a sleeping demon that even the Alliance isn't prepared to stop. They'll have to rely on Hugo's brains and Clara's demon talents if they want to keep the city safe.