Catholic-schooled seventh-graders Sophie, Margaret, Rebecca, and Leigh Ann help an elderly neighbor solve a puzzle her father left for her estranged daughter twenty years ago. First in a series. Sequels: The Vanishing Violin, The Mistaken Masterpiece.

A family living in the house of long-dead abolitionist Dies Drear must decide what to do with his stupendous treasure, hidden for one hundred years in a cavern near their home.

A black family tries to unravel the secrets of their new home which was once a stop on the Underground Railroad.

Eighth-grade sportswriters Stevie and Susan Carol team up to solve a mystery at the famous Army-Navy football game.

When Will Halpin transfers from his all-deaf school into a mainstream Pennsylvania high school, he faces discrimination and bullying, but still manages to solve a mystery surrounding the death of a popular football player in his class.

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.

After a knee injury destroys sixteen-year-old Cody's college hopes, he drops out of high school and gets a job in his small Montana town, but when his ex-girlfriend disappears from her Vermont boarding school, Cody travels cross-country to join the search.

One month before graduating from his Central Florida high school, Quentin "Q" Jacobsen basks in the predictable boringness of his life until the beautiful and exciting Margo Roth Spiegelman, Q's neighbor and classmate, takes him on a midnight adventure and then mysteriously disappears.

Teenage sleuth Bianca Balducci is asked to prove the innocence of Sarah's latest boyfriend Hector who is the prime suspect in a local art museum's missing paintings.

Elijah and his sister Elisha go undercover to investigate a mysterious school that is sheltering runaway teenagers for a sinister purpose. Sequel to Hangman's Curse.