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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.

"During auditions for the show 'Pop Star Sensation' at the local mall, one of the judges, a famous pop star, disappears, and the Aldens must find out where she went"--.

While true-crime aficionado Ellery and her twin brother are staying with their grandmother in a Vermont community known for murder, a new friend goes missing and Ellery may be next.

Twins Theo and Alexander along with their sister Wil are abruptly dropped off at their Aunt Saffronia's house, where they learn they must complete a series of tasks in order to see their parents again, the first of which is solving a mystery at the Fathoms of Fear waterpark.

"Fourteen-year-old Enola Holmes wakes on her birthday to discover that her mother has disappeared from the family's country manor, leaving only a collection of flowers and a coded message book.

Aunt Saffronia drops the Sinister-Winterbottoms off at the Sanguine Spa, which is possibly owned by vampires, and where they must continue to complete the tasks they have been set if they are to see their parents again.

The Sinister-Winterbottoms, twins Alexander and Theo and their older sister Wil, find themselves at a mysterious summer camp where they meet other families whose parents are missing.

Ziggy's mother disappeared ten years ago, one of the many Native women who have mysteriously gone missing, and Ziggy believes a secret cave may hold the key--so with his sister, Moon, and friends Alice and Corso, he sets out to find the cave and solve the mystery of his family's origins.

A research trip to the Amazon rainforest turns into a dangerous mystery when Ring and Asia Wilde's scientist mother goes missing, and in order to rescue her, they must use their skills to survive the jungle.

The Sinister-Winterbottoms, twins Alexander and Theo and their older sister Wil, find themselves at a mysterious summer camp where they meet other families whose parents are missing.

"In the middle of her parents' divorce, eleven-year-old Naomi and her brothers are sent to camp where children disappear and monsters stories are real"--OCLC.