January 1910. A journalist continues to be killed within a suspicious blaze. Everything factors to several suffragettes, but the obvious culprit insists she actually is innocent.

When Lady Hardcastle receives a letter from a suffragette requesting her urgent help, the retired spy turned sleuth understands just she stands between an accused youthful woman and the gallows. Proof at the scene makes Lizzie Worrel’s innocence tough to believe, and with the police treating it as an open-and-shut case of arson, Lady Hardcastle faces a barrage of resistance as she attempts to dig out the truth.

With her trusted maid and confidante, the formidable Flo, Lady Hardcastle sets off in search of the truth as time runs out for the accused suffragette. Was she setup? And if so, is the true culprit a traitor to the cause—or section of a darker conspiracy?