"A bombing injures private enquiry agent Cyrus Barker, leaving it up to his soon-to-be-married junior partner Thomas Llewelyn to find the person trying to murder them both before it's too late. In 19th century London, Cyrus Barker and his associate Thomas Llewelyn are renowned private enquiry agents, successfully employed by the highest levels of Her Majesty's government as well as private citizens. Their success, however, has led to their acquiring a powerful group of enemies, many of whom are determined to have their revenge."