When Kirsten's new friend Erik disappears, she has to figure out whether he ran away to get out of some promises he made, or whether something else has happened.

Enola Holmes, much younger sister of detective Sherlock Holmes, must travel to London in disguise to unravel the disappearance of her missing mother.

While his widowed mother continues to search for him, eleven-year-old Tom, presumed dead after drifting away down a river, finds himself trapped in a series of underground caves with another survivor and a dog, and pursued by murderous treasure-hunters.

Fourteen-year-old Enola Holmes, disguised as a beautiful woman, finds clues in floral bouquets as she searches for the missing Doctor Watson, a companion of her famous older brother, Sherlock.

When the difficult star of the reality television show "Expedition Survival" disappears while filming an episode in the Florida Everglades using animals from the wildlife refuge run by Wahoo Crane's family, Wahoo and classmate Tuna Gordon set out to find him while avoiding Tuna's gun-happy father.

"A twelve-year-old girl discovers her father is the keeper of the gateway between our world and The Dark, and when he goes missing she'll need to unlock her own powers and fight a horde of spooky creatures set on starting a war"--

Mary, a troubled teenage detective, must solve a missing persons case as she discovers the reimagined origins of infamous Disney Villains.

When eleven-year-old Gregor and his two-year-old sister are pulled into a strange underground world, they trigger an epic battle involving men, bats, rats, cockroaches, and spiders while on a quest foretold by ancient prophecy.

Twelve-year-old Emmy investigates the connection between her father's disappearance and a secret society at her prestigious English boarding school.

After fourteen-year-old Ozzy's scientist parents are kidnapped, Ozzy's only help may be a classified ad that says "Wizards for hire."