An elite group of underdogs trained to fight crime must save their unique school from shutting down.

A young detective is determined to uncover which of the Santas he sees in the big city is the one and only Santa Claus.

"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...

Fifth-graders Parker and Lucas get more than they bargained for when they seek to debunk one of Wolver Hollow's greatest legends about a haunted mustache that, every year on the anniversary of its owner's death, seeks a lip to claim as its own.

Young sleuths Abbi, Lydia, and Daniel are excited to search for clues of a cougar near Abbi's home, but they soon discover something more might be going on.

"When boarding-school student Oscar Drai meets Marina, she promises him a mystery and takes him to a secret graveyard deep in Barcelona, where they witness a woman dressed in black lay a single rose atop a gravestone etched with a black butterfly. Their curiosity leads them down a dangerous path, and they discover a decades-old conspiracy that puts their lives in the hands of forces more sinister and mystical than they could have believed possible"--...

When fourteen-year-old Marion's latest mask creation comes to life and possesses her crush, she must find a way stop the monster or risk it staying forever.

Haunted after helping her father on his ghost-themed Chicago bus tour, twelve-year-old Claire must discover what the spectral boy from the bus wants before it is too late.

"Weatherby is a fish out of water. When she lands a scholarship to the prestigious Boston School, she's excited to be in the same world as her dad, whom she's never met, and make real friends. But Weatherby has a secret she'll risk everything to protect, one that could destroy her new life. Every member of Jack's wealthy and privileged family has made their mark at the Boston School. Everyone, that is, except for Jack, who is entirely mediocre. He's...

Meeting at the Metropolitan Museum of Art on the day Japan bombs Pearl Harbor, four thirteen-year-olds help track down a missing book of Arthurian legends that may hold the key to preventing a second attack on American soil.