Catherine "Cat" Royal, an orphan who lives at the Drury Lane Theater in 1790s London, rallies her friends to try to save Pedro from the clutches of Mr. Hawkins, a slavemaster who considers Pedro his property.

Orphan Catherine "Cat" Royal, living at the Drury Lane Theater in 1790s London, tries to find the "diamond" supposedly hidden in the theater, which unmasks a treasonous political cartoonist, and involves her in the street gangs of Covent Garden and the world of nobility.

Rescued from the gallows in 1850s London, young orphan and thief Mary Quinn is offered a place at Miss Scrimshaw's Academy for Girls where she is trained to be part of an all-female investigative unit called The Agency and, at age seventeen, she infiltrates a rich merchant's home in hopes of tracing his missing cargo ships.