Martin Nanther, Hereditary Peer in the House of Lords, decides to make his great-grandfather, Dr. Henry Nanther, the subject of his next biography, not realizing that Henry's obsession with blood had a much darker side.

Fourteen-year-old Modo, a shape-changing hunchback, and Octavia take on another mission as secret agents for the Permanent Association in Victorian London, investigating the cause behind the sinking of several ships in the same place.

In Victorian London, after his life is saved by a young physician, a thief utilizes the knowledge he gains in prison and from the scientific lectures he attends as the physician's case study exhibit to create a new, highly successful, double life for himself.

In 1886 England, when fifteen-year-old Mariah begins working at the Prince Regent Hotel and discovers many previous workers have disappeared, he tries to solve the mystery, only to find that nothing is as it appears.

A ghost tale for Christmas time: Jack and Annie travel back to Victorian London when Merlin asks them to use their magic to inspire Charles Dickens to write "A Christmas Carol." A crazy day with cobras: The magic tree house whisks Jack and Annie to India during the Mogul Empire in the 1600s to search for an emerald needed to break a magic spell.

When William Weems, obscure moneylender, is murdered Ispector Pitt is asked to investigate and discovers Weems was a vicious blackmailer who had a list of some of London's most distinguished gentlemen in his office.

Mr. Gilbert and Mr. Sullivan, friends who write operas together, have a falling out when Mr. Sullivan refuses to compose music for yet another silly story, prompting Mr. Gilbert to try something completely new.

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.

In late nineteenth-century London, fourteen-year-old Enola Holmes, much younger sister of detective Sherlock Holmes, turns to Florence Nightingale for help when her investigation into the disappearance of a Crimean War widow grows cold.