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This series revolves around four orphaned siblings who live in an abandoned boxcar, embarking on various mysteries and adventures, led by the oldest brother Henry.

A series featuring the teenage detective Nancy Drew who solves mysteries, often with her friends Bess Marvin, George Fayne, and boyfriend Ned Nickerson.

A series of spy novels following the CHERUB organization which employs children as intelligence agents. The series is known for tackling mature themes from a youthful perspective.

Sammy Keyes is a high school sleuth who inadvertently stumbles on mysteries in her town, solving them with wit and the help of her friends Dot and Marissa.

This series features a trio of young detectives, Jupiter Jones, Peter Crenshaw, and Bob Andrews, who tackle an array of puzzling cases from their base in a trailer hidden among junk.

Revolves around four gifted children, Reynie, Kate, Sticky, and Constance, who are recruited by Mr. Benedict to stop a global crisis named 'The Emergency'.

Follows the life of Cammie Morgan, who attends the Gallagher Academy for Exceptional Young Women, a school that trains girls to be spies, balancing espionage with typical teenage problems.

Three intelligent orphans, Violet, Klaus, and Sunny Baudelaire, encounter a series of misfortunes as they try to uncover dark family secrets, often crossing paths with the evil Count Olaf.

Series follows Theodore Boone, a smart kid who dreams of becoming a great lawyer. He finds himself embroiled in legal dramas and aims to bring justice.

This series follows British teenager Alex Rider who is coerced into working for MI6, dealing with assassins, terrorist plots, and espionage.

Series about the much younger sister of the famous Sherlock Holmes, Enola Holmes, who proves to be a deft sleuth in her own right as she embarks on her own detective career.