The Case of the Million-Dollar Diamonds — Francine Pascal

Jessica and Elizabeth Wakefield and their friends in the Snoopers Club are on the trail of a diamond thief. They saw him in the mall jewelry store just before the precious gems were stolen. With the Snoopers' help, store guards catch the thief, but he has no diamonds! The Snoopers are determined to find them before the thief gets away with the million-dollar jewels. Will they catch him in time?