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Andrew and Evie are determined to find their mother before the Company does.

Twins Truman and Camille, spending winter break with their paternal grandmother, follow a secret passageway to the Breath World, where all creatures of magic dwell, to find the Ever Breath, a magical stone that maintains balance between worlds.

"Twelve-year-old twins Bickford and Rebecca Kidd and their two older siblings travel to Africa to track down priceless artifacts that will keep the family's treasure hunting business afloat long enough to rescue their kidnapped mother--and possibly find their missing father"--Provided by publisher.

"Seventeen-year-old mathematical genius Peter Blankman battles his lifelong panic attacks as he tries to find his missing twin sister, Bel, and those who nearly assassinated his mother, a famous scientist"--Provided by publisher.

Twelve-year-old Cameron discovers a magical hotel through which, with the help of new friend Nico, he hopes to find his long-lost father and help for his twin sister Cass's spina bifida.

"Echo Ridge is small-town America. Ellery's never been there, but she's heard all about it.

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.

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.

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.