Rescued from the gallows in 1850s London, 17-year-old 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 in order to trace missing cargo ships. Ages 11-14

While vacationing with her family in Las Vegas, seventeen-year-old Jasmine stumbles upon a murder mystery that she attempts to solve with the help of her friends, recently arrived from California.

Convinced her brother's death was murder rather than suicide, sixteen-year-old Frances begins her own investigation into suspicious student activities at her boarding school. Ages 12 up

When thirteen-year-old Logan and his family move into a run-down old house in rural Virginia, he discovers that a woman was murdered there and becomes involved with his neighbor Arthur in a dangerous investigation to try to uncover the killer. Ages 12 up

After winning a basketball reporting contest, eighth graders Stevie and Susan Carol are sent to cover the Final Four tournament, where they discover that a talented player is being blackmailed into throwing the final game. Ages 12-18

In nineteenth-century London, sixteen-year-old Sally, a recent orphan, becomes involved in a deadly search for a mysterious ruby. Ages 11-13

Connor is sure his best friend, Branwell, couldn't have hurt Branwell's baby half sister, Nikki. But Nikki lies in a coma, and Branwell is in a juvenile behavioral center, suspected of a horrible crime and unable to utter the words to tell what really happened. Ages 12-17

During a field trip in the local woods, Roni and Brian find the local archaeology professor, Andrew Dart, knocked unconscious in a cave, which leads them to investigate a land development scheme. Age 12 up

Eighteen-year-old Christopher, who plans to be a spy, learns of a murder cover-up through his summer job as a morgue assistant and teams up with Tina, a gorgeous newspaper reporter, to investigate, despite great danger. Age 12 up