When one of her fellow Ladies-in-Waiting becomes mysteriously ill, Lady Grace Cavendish suspects the cause is poison and sets out to learn who is responsible.

Thirteen-year-old Lady Grace Cavendish, maid of honor to Queen Elizabeth I, describes in her diary how she tries to discover who stole a magical ruby belonging to the visiting princess of Sharakand.

Thirteen-year-old Lady Grace Cavendish, maid of honor to Queen Elizabeth I, describes in her diary her efforts to discover who is counterfeiting the new English silver coin.

In small-town Australia, teens Jasper and Charlie form an unlikely friendship when one asks the other to help him cover up a murder until they can prove who is responsible.

Falsely accused of plotting to overthrow King Claudio, scholarly Mangus the magician, along with his street-smart servant boy, Fabrizio, face deadly consequences unless they can track down the real traitor by the stroke of midnight.

Some weird things--worse than the usual weirdness--have been going on at Mythos Academy, a school of myths and magic . After mean girl Jasmine Ashton is murdered in the Library of Antiquities, Gwen Frost is determined to figure out what's going on, especially since she was the one the killer wanted.

Bradley, Brian, Nate, and Lucy follow clues on an Easter treasure hunt, while trying to figure out who set it up for them.

Fourteen-year-olds Raphael and Gardo team up with a younger boy, Rat, to figure out the mysteries surrounding a bag Raphael finds during their daily life of sorting through trash in a third-world country's dump.

When doctored photographs of the President of the United States appear after an innocent Halloween party, his stepdaughter KC and her friend Marshall have to find the culprit in order to save the President's chances for re-election.

At a high school party, a girl finds her best friend murdered, only to be discovered holding the weapon and accused of the crime.