The robbery of the treasure in the tower proves to be an exciting challenge to Frank and Joe. Frank and Joe attempt to foil a ruthless espionage ring in their effort to sabotage the United States space program.

Ten brief cases allow the reader to match wits with ten-year-old crime-buster, Encyclopedia Brown, as he investigates such cases as whether a diary of George Washington's mother is authentic, or if a UFO picture supposedly taken by the army is real.

New friends and a mystery help Aden, thirteen, adjust to middle school and life at a dying western theme park in a new state, where her being born armless presents many challenges.

"The Nightwalkers are terrorizing Gotham City, and Bruce Wayne is next on their list ... Bruce will walk the dark line between trust and betrayal as the Nightwalkers circle closer"--

The Dunderheads--a gang of misfits with unique and unusual talents--come to the aid of one of their own when Spider is falsely arrested for stealing jewelry.

When a teenaged girl with a bad reputation is murdered in New York City's Central Park after a party, her childhood friend is determined to solve the mystery of who caused her death.

Seventh graders Max Finder and Alison Santos solve a series of mysteries with some help from the reader, in books that also include puzzles and challenges.

"When youth sleuth Sammy Keyes travels to Las Vegas to stop her mom from marrying her boyfriend's dad, she never expects she'll learn the identity of her absent father in the process"--Provided by publisher.

"Jameson and Grayson Hawthorne are each pulled into a different high-stakes game, where they must decide who they want to be and what they will sacrifice to win"--

After Minty discovers a secret tree with a hollow trunk that holds the secrets of everyone in the neighborhood, Raymond, a new boy drawn to the tree and Minty start watching their neighbors.