It's a blooming mystery! Nancy and her friends agree that the Pink Princess daisies they've grown from seed are the prettiest flowers ever. They're sure to win a prize at the spring flower show. But shortly before the event, the daisies disappear! Snobby fourth-grader Viola Van Hall told the girls that her flowers were going to take first prize. Classmate Orson Wong wanted the daisies for a horrible science experiment. Belle Bridges sprinkles flower petals all over her salads -- she might have eaten the daisies. Have the girls lost the chance to win the contest, or is the answer to the mystery right under their noses?