When a series of unusual murders point to Lou Hudson, Ironhill's monster whisperer, as the primary suspect, she has but one choice: find the real perpetrator before her trial begins or face execution. Lou, the last of the jinn, survives by hiding her abilities after the rest of the elementals fell victim to genocide. As a preternatural pest control expert and self-proclaimed guardian of the innocent, she's accustomed to trudging through the dregs of society. Hunting down a pesky murderer should be easy, especially with help from a dashing local media darling and a tantalizing Scottish vampire whose motives are a mystery. For Lou, though, nothing is ever simple. When she discovers the killer's identity, to reveal it would unearth her secret and go against her strict moral code, resulting in a deadly catch twenty-two.