His greatest creation could be the death of them both.

One woman swears to avenge the savagery of a ruthless killer loose on the streets of Lundun; if only she can stay one step ahead of an inventor who fears that his greatest work, a labor of love, has turned on humanity.

Grieving the loss of her beloved cousin, Ella Wilder is determined to catch the murderer. Infuriated by the fumblings of the constable, she seeks the assistance of a handsome noble who seems to be looking for his own answers, and whose reluctance tells her he has something to hide. Over time, hesitant intimacy grows into fiery passion but brings them no closer to finding the madman.

As the killer reveals darker inventions that blur the boundary between man and machine, Ella fights the fear he may be after her next. Can Ella trust her heart to the man who refuses to share his secrets yet swears to protect her? Will Bennett be able to choose between keeping terrifying family secrets...or losing...