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Amateur sleuth Alec and his sidekick Gina investigate when the Christopher Columbus exhibit disappears from the museum.

Two teenage sleuths help their detective father search for a famous rocket scientist whose disappearance endangers the launching of the Firebird Rocket.

Sam and Sophie, two sisters from Queens, New York trying to create new lives in Venice, Indiana are at it again-- this time trying to solve a missing persons case involving Wilda Higgins and Griffin Gateaux all the while trying to keep themselves from being discovered.

Nancy's disappearance leaves the story in the hands of alternating narrators--Nancy's good friends George and Bess (although it's not always easy to tell their voices apart).

In 1887, in a San Francisco populated by dogs, retired veterinarian Dr.

When one of the Hardy Boys disappears while on a campout, the other is left behind to search, hoping he will see his brother alive again.

Frank and Joe investigate the disappearance of eight children from Misty Falls State Park in Idaho over the last twelve years after one of the missing children reappears with no memory of anything that happened previously.

When Nancy and her friends travel to New York so that Nancy can participate in the next round of the Miss Pretty Face Beauty Pageant, they investigate shady dealings involving the cosmetics company that is sponsoring the contest.

Hunter Braque, a New York City teenager who is paid by corporations to spot what is "cool," combines his analytical skills with girlfriend Jen's creative talents to find a missing person and thwart a conspiracy directed at the heart of consumer culture.

The reader is asked to travel to Thailand to investigate the disappearance of an American businessman, and can choose between alternative adventures, each leading to nineteen possible endings.

When her stepsister, Trisha, disappears, Robyn feels responsible and sets out to find Trisha, unaware of how dangerous life on the streets is and what danger Robyn is putting both herself and Trisha in.

Assigned to create an imaginary business for a school assignment, best friends Darcy and Norah organize a make-believe detective agency that unexpectedly receives a real case when someone goes missing under sinister circumstances.

Reporter Wendy Tynes has made it her mission to bring down sexual preditors on national television, but she begins to doubt her instincts after exposing social worker Dan Mercer until she discovers a link between Mercer and Haley McWaid, a seventeen-year-old girl from suburban New Jersey who has been missing for three months.

A novel consisting of the diary entries of troubled missing teenager Alice Brown, which her boyfriend, high school senior Tom Sinclair, has published, hoping that someone can make sense of its cryptic passages and provide clues to her whereabouts.

High school senior Tom Sinclair's journal chronicles events leading up to the disappearance of Alice, the only person he has confided in after moving from Vermont to Manhattan in an attempt to run away from his past.