Suspecting that Cary and his Mischief Knights are behind recent school vandalism pranks, Kristy and the Baby-sitters begin an investigation that challenges them to solve eight puzzles in order to catch the real culprits.

The hit series is back, to charm and inspire another generation of baby-sitters! Kristy can hardly believe it when little Jake Kuhn is reported missing. Jake is one of the kids on her softball team, and Kristy was one of the last people to see Jake before he disappeared.Even though the Baby-sitters and all of Jake's friends are helping look for him, Kristy still feels horrible. And when the police can't find Jake after almost two days, things look really serious. Kristy knows she's just a kid, but she'd determined to find Jake, wherever he is . . . .The best friends you'll ever have are detectives, too!

Suspecting that Cary and his Mischief Knights are behind recent school vandalism pranks, Kristy and her friends begin an investigation that challenges them to solve eight puzzles in order to catch the real culprit.

Learning that a local girl who was humiliated at a prior event is trying to sabotage the Stoneybrook Middle School Mischief Night Dance, the baby-sitters hope to stop the girl and set things right.

The rest of the Baby-sitters are shocked when Mary Anne, tired of being a plain Jane, gets a chic new haircut and a new wardrobe, and their reaction enrages the excited Mary Anne.

Accompanying young child star Derek Masters aboard the "mystery train" that is publicizing his newest movie, Kristy, Abby, and Stacey fend off a saboteur who is staging dangerous accidents.

When their car breaks down in a snowstorm, Kristy and her softball team are forced to stay overnight in a creepy mansion.