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Jigsaw Jones investigates when the champion frog in a frog-jumping contest mysteriously disappears.

Guided by her rules, nine-year-old Allie works to get past being just the new girl at school, eagerly awaits the arrival of her kitten, and faces turmoil when her grandmother visits while the family is still settling into their new home.

Though it means Nate can't get his dog ready for the smartest pet contest, he agrees to search for the missing prize for the contest.

The Boxcar children uncover a mystery when they compete in several contests at the county fair.

Winston and his friends enter an all-day puzzle contest to win fifty-thousand dollars for their school, but they must also figure out who is trying to keep them from winning.

When someone steals the winner's trophy for the school book project, Clarice emulates her favorite book heroine, Ruby Redfort the detective, to solve the crime.

Nancy, Bess, and George are dismayed when someone destroys their entry in the sand castle contest--and leaves them a threatening message.

Nancy Drew investigates when a contest is in danger of being ruined because the brass rings have suddenly disappeared from her town's carousel.

Young Nancy Drew investigates when a friend's recipe for a local ice-cream factory contest goes missing.

A master criminal known as The Chameleon threatens to disrupt a mystery contest being held in the public library, but J.

The Freaky Joe Club is determined that their team, the Sea Dragons, will beat the Sharks when the Imagination Railroad competition comes to the Edith R.

Frank and Joe must find out who is playing pranks that threaten to ruin a detective contest.

Benny Bensky, dog detective, is blamed for stealing contestants' pumpkins during the Giant Pumpkin Weigh-off.

Elsa is working as a counselor at Green Spring Pony Club's summer camp, preparing the girls for a regional competition, when one of the horses is sabotaged and she must call on Nancy Drew for help.

When her puppy refuses to perform at the Amazing Pet Contest, Nancy Drew uses her sleuthing skills to find out who sabotaged her pet's chance to appear on a popular television show.