The season comes to an explosive climax when Eliza receives a bomb in the mail. Who sent it and why? Eliza teams up with the Duke, Moses and her old enemy Patrick Nash to find out who is behind the deadly delivery.

Eliza finds herself in fresh and surprising mysteries, ranging from a disappearing magician to police corruption, as she struggles to build her detective agency. Growing competition from a rival agency creates new problems, and all the while she is still juggling her relationship with Inspector William Wellington, the Duke. And she has a new challenge on that front: a beautiful woman from her childhood has caught the Duke’s eye.