When Detective Kat Donovan matches on a dating app with the fiancé who disappeared years before, she learns that some secrets are best left in the past.

Set in 19th-century London, this TV mini-series follows the gripping life of a secret agent as he takes on dangerous missions in the Victorian era. With a backdrop of espionage and intrigue, the story explores the dark underbelly of London's Soho district and the challenges faced by the protagonist in his quest for justice.