A Nighthawk investigator must solve the disappearance of a starlet before becoming the next victim of a mechanical terror stalking Victorian London. Perry Lowell, a logical Nighthawk, and her reckless partner Garrett are tasked with finding a missing theatre actress. Their investigation uncovers a theatre full of suspects, including a charming understudy, and rumors of a 'Clockwork Menace' that haunts the venue. The case strains their professional partnership, and Perry finds herself in increasing danger as the murderer begins to focus on her.

This novella is presented as a prequel to a romance, focusing on the development of a partnership under duress rather than a full-blown romantic relationship. The narrative is set within a steampunk-infused Victorian London, featuring a society of vampires and a protagonist who operates as a Nighthawk investigator. The plot centers on a mystery involving a missing actress and the threat of a mechanical antagonist, creating tension between the lead characters. The description indicates a focus on angst and suspense, aligning with the gaslamp fantasy and paranormal romance subgenres.