"Charlie! Help!? Charlie's friend Margot is missing her hat. ?It's a princess hat?purple and cone shaped. I need it for tonight's play!?

With Watson along, Charlie searches for clues all over school. They find a cylinder-shaped hat and a half-sphere hat and lots of purple sparkles, but it's shaping up to be a tough case. . . .

Will Charlie and Watson find Margot's hat before the play begins?

Three Cheers for Charlie Piechart and the Case of the Missing Pizza Slice

?A lighthearted tone and newcomer Comstock's playful graphics, which have a weathered, retro quality, make the lesson go down as easy as pie.??Publishers Weekly

?Kids will have fun following Charlie as he solves the mystery and reinforce their fraction skills along the way.??Kirkus Reviews

Marilyn Sadler has written more than 35 books and has won 12 awards. She received 1 Emmy nomination for her animated series, Handy Manny (which averaged around 2 million viewers a week!). She is the author of the P. J. Funnybunny books and the books about Alistair.

Marilyn lives in Ohio with her cat, Alice, who's shaped like a half sphere when she is sleeping and who acts like a princess when she's awake. Marilyn is 1/2 of the team that created the world of Charlie Piechart. Visit her online at www.marilynsadler.net.