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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.

"When Nell Magnificent's awful parents go to Paris for a business trip, she surprises them by tagging along.

"Rumors spread that Tobias Hawthorne's lost son may still be alive, casting doubt on seventeen-year-old Avery's inheritance and changing the rules of the game"--OCLC.

"Eighteen-year-old Avery Grambs is weeks away from inheriting the multibillion-dollar Hawthorne fortune, but first she'll have to survive a dangerous game against an old enemy looking for vengeance"--Provided by publisher.

Emotionally crippled by his obsessive-compulsive disorder, teenager Matthew Corbin rarely leaves his room on a cul-de-sac in London, and he passes the day observing and writing down his neighbors doings from his window--but when a toddler staying next door disappears Matt is the key to solving a mystery and possibly saving a child's life .

Beatrice Fletcher, great-grandniece of famous mystery writer Jessica Fletcher, is obsessed with the unsolved mysteries and murders of Cabot Cove, Maine, but this time the case becomes personal when her best friend Jackson disappears and she must rely on the help of three students from the elite Broadmoor Academy to find him.

"When siblings Hedy and Spencer are forced to spend time with their reclusive and eccentric grandfather, they find themselves on a quest to solve the mysterious disappearance of their grandmother decades earlier.

"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.

Accused of murdering his girlfriend, who disappeared after they were in an accident, Hunter Gifford races against time to clear his name, putting his freedom, family and life at risk, as his former best friend makes a true-crime documentary condemning him.

"When Sky Patel-Baum is sent to live with her mysterious uncle, she never imagines she'll end up in Area 51, a top-secret military base with a bajillion rules.

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.

While searching for her missing mentee Noreen at the Younwity Hidden Institute of Witchcraft, Abby discovers Noreen's disappearance is connected to another girl who went missing years earlier, which places her own life in danger.

Teenage sisters Nora and Sophie's bond is tested when Sophie's boyfriend Garrett goes missing after a party, and Nora, possibly the last person to see him, becomes the primary suspect.