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"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.

Usually avoiding adventure of any kind, eleven-year-old Leo is unfortunately drawn into a mystery, along with his danger-loving sister, when his late Grandma's beehives go missing and his ornery Grandpa needs help catching the sticky-fingered thieves.

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.

"When the Aldens take up the case to investigate if a catastrophic oil spill that affected hundreds of species could have been prevented, they are led on an adventure to help other endangered animals around the world"--OCLC.

"The Aldens head to Ladakh, a territory in northern India, to help save the elusive and critically endangered snow leopard"--OCLC.

Eleven-year-old Amelia thinks of herself as devoid of talent, but when the dragonfly staff goes missing seven days before the Dragonfly Day Festival, she takes it upon herself to catch the thief and save her town.

Twins Theo and Alexander, their older sister Wil, and five new friends find themselves at an electrifying manor run by Mister Frank and Dr.

After their guardian disappears, twelve-year-old twins Jess and Jude are fostered by the Blakeney family, but their search for information about their parents puts them in danger when they uncover secrets their wealthy benefactors want to keep hidden.

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.

"Try as they might, the McGinn family can't seem to escape from the clutches of the EXIT 13 Motel.

In Fall River, Massachusetts, home to New England's infamous Bridgewater Triangle, Tessa must prove her brother innocent of murdering his girlfriend's parents with an axe, a mystery that proves all too close to the Lizzie Borden murders one hundred years earlier.

When a gruesome murder rocks Sunny's private school, with her own brother as the main suspect, she takes it upon herself to discover the real killer--and uncovers a slew of dark family secrets in the process.

Ring and Asia Wild accompany their parents to the Sea of Cortez in Baja, Mexico to search for the endangered vaquita and uncover a dangerous conspiracy.

Following the clues left behind, Theo and Alexander find themselves at Siren's Song Seaside Amusement Park, where they must work together to escape, stop their newfound nemesis Essa, save Wil and their friends, and find their parents.