Sally Hemingway and the Chocolate Chip Cookie Mystery-signed copy

Sally and Aaron decide to do a friendly bakeoff and sale competition. Whoever sells more cookies wins. Aaron is making sugar cookies and Sally is making chewy chocolate chip cookies.

But when the say of the sale comes around, Sally's cookies have completely and mysteriously disappeared.

If the puppy ate them, then he is going to get very sick. And if the puppy didn't take them, then who did?

This is the 6th book in The Number Investigators Series. A series that uses number talk in dialog between characters and discusses science, math, and business topics ideas. As well as humor between the characters.

Your paperback copy will be signed by the author-Martin Tiller.

Books will be shipped in in middle of July.