When her friend Monday Charles goes missing and Monday's mother refuses to give her a straight answer, Claudia digs into her disappearance.

"Around the globe, exceptional mice live in the shadows. Under the direction of famed mouse inventor Gadget Hackwrench, they work together as a team to solve big problems using small gadgets. They are highly trained. They are nearly invisible. And they love cheese." --

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. Sky feels like she's landed in a whole new world, even though she hasn't left the planet. Because guess what? Area 51 is full of aliens. Lots and lots of aliens. But something even stranger is happening in Area 51--aliens are going missing. Where could they be? How come everyone thinks sky and her uncle are involved...

Witty typewriter Olivetti and twelve-year-old introvert Ernest embark on a mission to find Ernest's missing mother that takes them across San Francisco.

Eleven-year-old Juniper sets out on a wild adventure to find her mother and protect a public park just days before Christmas.

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.

When her sister Sylvie goes missing on a snowy morning and is never seen again, Jules refuses to believe she is gone forever, meanwhile, in the shadow world, a shadow fox is born.

Cordelia Clay loves the work she and her father do together: saving and healing the remarkable creatures around Boston at the end of the nineteenth century. Their home on Cedar Street is full to the brim with dragons, squelches, and diggles, and Cordelia loves every one of them. But their work must be kept a secret, others aren't welcoming to outsiders and immigrants, so what would the people of Boston do to the creatures they call 'monsters'? One...

Thirteen-year-old Sophia Tims, with her friend Theo, continues to search for her parents, explorers who have vanished as the borders shift within a world transformed by the Great Disruption of 1799.

Working as a nanny in the Hamptons before starting college, Anna learns of her weird connection to a missing girl, but after she confesses to manslaughter a podcast producer helps reveal life-changing truths.