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Young detectives Frank and Joe Hardy, investigating the disappearance of a professor, encounter a hot-tempered hermit, and sabotage at the radar station and Honeycomb Caves.

When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cave on an island along the way.

The Boxcar children travel to Maine, take canoes into the wilderness and live in a house exactly like the one on Surprise Island, except the Maine house is brown, not yellow.

When one of their tightly-knit group mysteriously disappears, four high school girls find their friendship difficult to maintain when they begin receiving taunting messages from someone who seems to know everything about their past and present secrets.

When Mr. Hardy disappears while investigating a mystery surrounding a vacant house rumored to be either haunted or an abode for criminals, the Hardy Boys search for the truth.

Panic mounts in the sleepy little town of Aurelius, New York, after three young girls vanish, one after another, and soon it seems that no one is immune from suspicion.

"While attending an amusement park under the new ownership of their friend Daisy, Joe and Frank investigate the disappearance of a patron who was last seen riding a hit attraction, an event that has threatened Daisy's family's livelihood"--OCLC.

Students from Walker High School becomes worried when their teacher, Mr.

"When the daughter of Bayport's amusement park owner goes missing, Joe and Frank follow clues to find the girl and determine if her disappearance is related to that of another missing person"--OCLC.

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.

Told in separate voices, Lena and Aubrey, each hiding their own secrets, set off in search of the truth about Charlie, including if he is really dead, after meeting at his funeral and learning that he was dating both of them.

A seventeen-year-old girl runs a fake paranormal detection agency, but when she takes a case involving a non-paranormal missing person, things start to get strange and her feelings for partner Sky Ramsey start to grow.

Twelve-year-old Lizzie Durango lives in a zoo, spending her days taking note of the animals' behaviors, then she meets runaway Tyler Briggs and together they investigate the wolves who are suddenly dying.

"A young woman haunted by a family tragedy is caught up in a dangerous web of lies and deception involving a secret society in this .

The Chicken Squad is on the case when their beloved human, Barbara, goes missing around the same time they hear a report of a headless bear on the loose.