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When his father is arrested as a debtor in 1849 London, fourteen-year-old John Huffman must take on unexpected responsibilities, from asking a distant relative for help to determining why people are spying on him and his family.

When Ted and Kat's cousin Salim disappears from the London Eye ferris wheel, the two siblings must work together--Ted with his brain that is "wired differently" and impatient Kat--to try to solve the mystery of what happened to Salim.

Xena and Xander Holmes, an American brother and sister who are living in England, use clues from their ancestor Sherlock Holmes' casebook when they are asked by a classmate to find an ancient Egyptian artifact that has been missing for many years.

Pursued by her much older brother, famed detective Sherlock Holmes, fourteen-year-old Enola, disguised and using false names, attempts to solve the kidnapping of a baronet's sixteen-year-old daughter in nineteenth-century London.

Sixteen-year-old Laura, an American living in London, tries to find the person responsible for the death of her younger brother Billy, who has been killed by a terrorist bomb.

In 1878 in London, Sally, now twenty-two and established in her own business, and her companions Frederick and Jim try to solve the mystery surrounding the unexpected collapse of a shipping firm and its ties to a sinister corporation called North Star.

In nineteenth-century London, sixteen-year-old Sally, a recent orphan, becomes involved in a deadly search for a mysterious ruby.

Tim Diamond, a poor-minded detective, is entrusted with a package worth five million dollars, until the owner of the package is murdered, and it is up to Tim and his brother, Nick, to outwit every crook in town who is trying to get the money.

Thirteen-year-old Nick Diamond has been framed for a robbery and must break out of jail in order to find the real criminals; however, between his bumbling older brother and the real crooks, he might be better off staying put.

Fourteen-year-old Nick and his bumbling detective brother Tim Diamond investigate a mystery involving international spies and assassins.

Contains a collection of three Diamond Brothers mysteries in which Tim and Nick bungle their way through a search for a missing philanthropist, find themselves in a Parisian prison, and are stranded on a Scottish island with a murderer.

Enola Holmes, much younger sister of detective Sherlock Holmes, must travel to London in disguise to unravel the disappearance of her missing mother.

Three teens and a curator of unclassified artifacts at the British Museum match wits with a madman determined to use unorthodox methods to reanimate the dead, both humans and dinosaurs.

Recently qualified as a forensic investigator, sixteen-year-old Luke Harding is assigned to the slums of London, where he and his robotic sidekick Malc investigate a doctor's murder.

In 1867, Sherlock Holmes, an impoverished young outcast with a Jewish father and a highborn mother, visits the scene of a woman's brutal murder, where he meets a wrongly accused young Arab and becomes a suspect himself.