When Hallie and Cory cross a magic branch that shrinks them to mouse size, they make the acquaintance of Mr. Snuggywhiskers-the friendly, well-spoken mouse who lives in the tallest tree in their backyard. From the day that Hallie discovers his tiny red door to the moment that Hallie and Cory realize their mysterious connection with Mr. Snuggywhiskers, they find out how enchanting the world of Mr. Snuggywhiskers can be.