Told in two voices, a seventeen-year-old battered and bruised girl struggles to remember who she or the man claiming to be her father is while seventeen-year-old Drew stops at nothing to find his missing girlfriend.

Eleven-year-old Zander is determined to save his grandmother's nineteen-story out-of-this-world department store from an evil force.

Mandy, Celia, and Jonathan arrive in Holland wondering why Uncle Ned warned them that the tranquil land of windmills harbors a dangerous mystery.

Teenage Lauren must confront her dark past when she gets pulled into a murder investigation involving her new fling and his brother.

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.

After arriving on a remote island to star in a reality television show, ten teen influencers find themselves caught in a deadly game, and as they receive threatening messages from a mysterious Sponsor, the influencers must figure out who is trying to "cancel" them before it is too late.

Thirteen-year-olds Sloane and Amelia embark on their first paid detective job to find a time capsule buried on the grounds of Cedar Point Amusement Park, but encounter opposition from a vengeful schoolmate, the park manager, and a ghostly figure.

Nancy investigates the disappearance of the bride while attending the wedding of her friends Bess and George's cousin Veronica's wedding to the owner of local extreme sports complex in Las Vegas.

Pekin Dewlap hasn't seen a ghost since she was twelve. But she'd do anything to get them back. Starting a ghostbusting business with her two best friends, Amber and Scout, seems like the perfect way to accomplish her goal. Of course, playing with ghosts isn't high on their wish list, so Pekin has to do some arm-twisting to get them on board.

"There are some things you should know about Harriet Wermer. She used to lie a lot, but not anymore. Seriously, she only tells the truth now. Even though she hadn't wanted to come to Marble Island in the first place, now she doesn't want to leave. It's the truth. With her mom and new baby brother home from the hospital, it's almost time for Harriet to pack up and head home from Marble Island and all the friends she's made. But Harriet doesn't have...