The Gentleman Spy Mysteries Books in Order

Sir Henry March needs a respectable marriage to secure his daughter's social future, while painter Isabella seeks independence. Their pretend courtship intersects with his investigation of a secret society, exposing dangers rooted in Isabella's past.

Secret agent Henry March shelters Eliza Broad after she escapes her abusive stepfather. As their relationship grows, her discoveries pull them into London's trafficking underworld and a hunt for a traitor responsible for stolen military secrets.

Eliza Broad helps fellow spy Allen Strathem recover from brutal captivity after his return to England. When danger follows him home, their effort to confront his tormentor exposes a larger threat and brings long-concealed feelings into focus.

Emily March hopes for a loving marriage, but her father's unresolved conflict shadows her romance with Max Warthon. Confronting his grandfather's hostility forces the couple to investigate old secrets that threaten both their happiness and their lives.