When thirteen-year-old Sherry is visited by the ghost of her mother asking Sherry to help solve a case involving rhinoceros poaching at the San Diego Wild Animal Park, Sherry's involvement not only helps save the rhinos, but it also brings mother and daughter closer together than ever before.

Eighth-grade sports reporters Susan Carol and Stevie reunite at the U.S. Open tennis championships where they investigate the mysterious disappearance of a top Russian player.

Fourteen-year-old Bobby, living in a small Massachusetts town just after World War II, finds himself facing many new challenges as he tries to pull together his coachless basketball team, cope with new feelings for his old friend Joanie, and discover the identity of the mysterious stranger who seems to be threatening his teacher.

As an eyewitness to two murders, a Montana teenager relates the shocking story behind the crimes in a police interrogation interspersed with flashbacks.

When a frightening murder occurs after one of her famous mother's rock concerts, sixteen-year-old Shayley tries to help the police find the killer and to determine whether her long-lost father has some connection to the crime.

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.

Ninth-grader Sherman Mack investigates the "Defilers," a secret group at his British Columbia high school that marks certain female students as pariahs, at first because he is trying to protect the girl he has a crush on, but later as a matter of principle.

Fifteen-year-old Matt and his new friend Robin search the globe to retrieve an ancient code--rumored to have brought down the ancient civilization of Atlantis--from the hands of a madman who is bent on destroying the modern world.

Teenage James has forty-eight hours to rescue a kidnapped professor and to keep a powerful weapon from falling into the wrong hands.

When seventeen-year-old Calla's mother suddenly dies, she goes to stay with her psychic grandmother in Lily Dale, a spiritualist community in western New York, where she discovers some disconcerting secrets about her practical, down-to-earth mother, and realizes that she herself may also have some psychic abilities.