Kat Holloway, a cook in Victorian-era London, receives a surprise visitor one day; it's Charlotte Bristow, the wife of Joe Briscoe, to whom Kat had once been married and was thought to be lost at sea over a decade ago. Charlotte claims Joe has now been murdered, and she offers Kat a share of Joe's fortune if Kat can figure out who killed him. Kat teams up with her friend Daniel McAdam and the two must hurry to solve the mystery before they become the killer's next victims.