After surviving a train crash, Victorian crime scene photographer Sarah Bain Barrett and her husband Detective Sergeant Barrett find a woman who's been strangled to death. In this 6th outing (after Portrait of Peril), they follow the clues to London's Cremorne Gardens, a seedy riverside pleasure park. Launching a clandestine investigation, Sarah and her friends have too many suspects: a dwarf, a female acrobat, and a member of the Royal Family. Meanwhile, Sarah's father goes on trial for a murder that occurred 20 years ago, and her life will be changed by the outcome.