When Kirsten's neighbor and friend, Erik Sandahl, disappears, everyone believes he is skipping out on the money he owes Uncle Olav, but Kirsten believes that something is terribly wrong and sets out to clear her friend's good name.

"When best friends Abbi and Skylar witness a clandestine meeting between a mysterious woman and someone in a dark van, they're thrilled. Finally, a mystery to spice up the summer! Who could these people be? Why are they meeting? Are they spies? Criminals? The two girls are determined to find out. But then a local woman goes missing and is found dead in the woods. And Abbi and Skylar realize that their detective work could hold the keys to solving...

Frank and Joe solve a mystery involving the disappearance of a professor, a hot-tempered hermit, sabotage at the new Bayport Coastal Radar Station, and the Honeycomb Caves.

Born on Water Island in the Virgin Islands during a hurricane, which is considered bad luck, twelve-year-old Caroline falls in love with another girl--and together they set out in a hurricane to find Caroline's missing mother.

SoHo, 1981. Twelve-year-old Olympia is an artist -- and in her neighborhood, that's normal. Her dad and his business partner Apollo bring antique paintings back to life, while her mother makes intricate sculptures in a corner of their loft, leaving Ollie to roam the streets of New York with her best friends Richard and Alex, drawing everything that catches her eye. Then everything falls apart. Ollie's dad disappears in the middle of the night, leaving...