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

Reynie, Kate, Sticky, and Constance, all graduates of the Learning Institute for the Very Enlightened and members of the Benedict Society, embark on a scavenger hunt that turns into a desperate search for the missing Mr. Benedict.

When his father disappears while experimenting with a black mirror that is a portal to both the past and the future, Jake encounters obstacles when he tries to use the mirror to find his father.

When imposing biology teacher Mrs. Bunny Starch goes missing, Nick and Marta suspect foul play.

When Aero Horizon 16 crashes in the Arctic, eight children emerge from the wreckage to find themselves alone and surrounded, not by ice, but by a mysterious and deadly jungle full of carnivorous plants and predatory birds--the other five hundred people from the plane are gone, not necessarily dead, but taken by something that lives in the jungle.

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.

After years in foster care, April gets to live in a mansion where she and four other children are caught up in a mystery related to a missing heir, a lost legacy, and the Phantom.

Relates the tale of Jack who, after trading his mother's milk cow for magic beans, climbs a beanstalk to seek his missing father in the land of giants.

In a futuristic world where humans and robots are at war, a boy goes on a search to find his missing military father.

While five little mice at Mouseford Academy are looking for their missing biology professor they dive to a haunted shipwreck off Whale Island to find a rare diamond that was lost when the ship sank.