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When she investigates the mysterious light up on Hogback Hill, eleven-year-old Hadley finds and befriends a hunchbacked old woman with a tragic past.

When the local baseball coach is murdered, sixteen-year-old Hope Long's mute brother is accused of the crime.

While staying with his grandparents in Castle-on-the-Hudson, Charlie stumbles upon a mystery but must learn American Sign Language to keep up with Frog, a deaf girl who wants to help solve it.

"When a Castle-on-the-Hudson school legend suddenly goes missing, Charlie is the prime suspect but he and his best friend, Frog, are determined to find the real culprit"--Provided by publisher.

Third grader Aven Green, who was born without arms but believes that her missing arm cells went to her super-powered brain, tries to solve two cases involving her teacher's missing lunch and the disappearance of her great-grandmother's dog.