On a cold winter day in Chicago, Early's father disappeared, and now she, her mother and her brother have been forced to flee their apartment and join the ranks of the homeless--and it is up to Early to hold her family together and solve the mystery surrounding her father.

The Greystone kids thought they knew. Chess has always been the protector over his younger siblings, Emma loves math, and Finn does what Finn does best--acting silly and being adored. They've been a happy family, just the three of them and their mom.But everything changes when reports of three kidnapped children reach the Greystone kids, and they're shocked by the startling similarities between themselves and these complete strangers. The other kids...

When authorities threaten to take Sophie, twelve, from Charles who has been her guardian since she was one and both survived a shipwreck, the pair goes to Paris to try to find Sophie's mother, and they are aided by Matteo and his band of "rooftoppers."

Mandie and her friends search for Mandie's aunt's missing turkey. In doing so, they uncover other mysteries including a missing doctor.

The Sinister-Winterbottoms, twins Alexander and Theo and their older sister Wil, find themselves at a mysterious summer camp where they meet other families whose parents are missing.

Alex Cross' son, Ali, is eager to follow in his father's footsteps as a detective, but when his best friend goes missing, what price will he have to pay to solve the mystery? Ali Cross is determined to follow in the footsteps of his father, former detective and FBI agent Alex Cross. When Ali's best friend Gabe goes missing, Ali knows that with every passing day, the less likely Gabe will be found. This is Ali's very first case. If he inherited any...

"One day a young couple wakes to find a boy asleep on their porch. Unable to speak, the boy cannot explain his history. What kind of people would leave their child with strangers? All John and Marta know is that they have been chosen to care for this boy. As their connection to him grows, they embrace his exuberant spirit and talents. The three of them blossom into an unlikely family, but how long can their happiness last?"-- From dust jacket flap....

Days before his thirteenth birthday, science-lover Finn learns that the women of his family are time travelers and he is expected to help locate his missing mother.--

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.

When people start vanishing from a godforsaken trailer park next to the Folsom Energy Plant, two eleven-year-olds investigate using mathematical clues that were hastily planted by their friend Mrs. Clarke before she disappeared.