When he keeps insisting that his little brother is missing even though no one else can remember that Liam ever existed, Charlie and his best friend Ana are determined to follow the instructions on a note that may help them find out what happened to Liam.

Twelve-year-old Lark Heron-Finch inherits a house on Swallowtail Island in Lake Erie, where she untangles a decades-old mystery and saves the island from unscrupulous developers.

Five murder suspects are invited to the haunted Barclay Hotel for a weekend getaway, and it is up to twelve-year-old JJ and eleven-year-old Penny--and a lonely ghost--to figure out who committed the crime.

Twelve-year-olds Oliver Beane and Frankie Figge are starting middle school in their suburban town of Lake Grove Glen, but from the beginning things seem a little weird, starting with the mysterious girl Matilda Sandoval who seems to know a lot about the boys, and continuing with a series of apparently random events that may not be random at all; somehow it all leads back to Preston Oglethorpe, a former student genius at their school who won the Nobel...

When Lizzie and Gael share an irresistible challenge, to find the peacock ring that once belonged to artist Frida Kahlo, Paloma decides it is the perfect way to honor her father.

Ten-year-old Rory Branagan teams up with his neighbor, Cassidy Corrigan, and canine sidekick, Wilkins Welkin, to investigate his father's disappearance seven years before, but first gets caught up in neighborhood mysteries.

In a small California town during the summer between fifth and sixth grade, three children investigate when hundreds of rubber duckies show up in Mr. Babbage's backyard,

Fourteen-year-old Andrea Hernandez-Baldoquin hails from a family of spies working for the factory, an international organization dedicated to protecting people of color. Andrea has dreamed about getting her first solo mission, but she never imagined that she would have to straighten her hair and go undercover as a white girl to befriend the estranged son of a dangerous white supremacist. In order to gain the boy's trust, Andrea finds herself doing...

While accompanying her parents to Paris, twelve-year-old Nell sets off to investigate the disappearance of her beloved, former au pair, affectionately known as Pear.

"Twelve year old Devlin Quick is determined to bring a thief to justice when someone steals a page out of a rare maps book in the New York Public Library"--