A Victorian-era Nancy Drew meets The Woman in the Window as true crime and historical fiction collide in this atmospheric thriller featuring real-life figures and a rebellious, uniquely inventive young reform school inmate determined to solve the serial killer case dominating the headlines in London, and soon, in the world: the Jack the Ripper murders.

London, 1888. Committed to the Whitechapel Hall Reform School for “incurable delinquency” Adelaide “Dell” Morton is a precocious, defiant misfit. She’s also a voracious reader of true crime and detective fiction, including the sordid, sensationally popular Penny dreadful stories. In an unlikely stroke of luck, she’s found a kindred spirit in her poised, perfectionist roommate, Pippa. Their obsession is only further fueled by the Jack the Ripper murders blazing a trail of terror throughout London’s seediest streets . . . right outside Whitechapel Hall’s front door.

Desperate for adventure, they embark on their own investigation—and discover an ally in Noah, son of the local butcher. But Noah’s motives are not mere fascination: His father is the prime suspect. Noah is desperate to clear his name, and Dell and Pippa are only too eager to help.

Their budding spywork soon yields shocking results: they witness straightlaced Whitechapel teacher Miss Kaye escaping the school the night of the latest crime. Could Jack the Ripper be a she? Delving into Miss Kaye’s background, Dell is both horrified and thrilled to find that within Miss Kaye’s past lies a chapter dark enough to rival any Penny dreadful . . .

Dell’s fixation with Miss Kaye reaches dangerous heights while a series of suspicious events leave Miss Kaye in sole command of Whitechapel Hall. Trapped in their teacher’s ever-tightening web of control, the three devious detectives devise a risky plan to track her. But what ensues may only propel them ever deeper into secrets, lies, ruthless acts, and betrayals that go back decades—and a confrontation that will irrevocably change the fates of all involved . . . if they survive.