Jack loves playing the trumpet, and for weeks he's been looking forward to taking part in his first concert. But on the morning of the big day, Jack finds he has a Worry. And his Worry starts to grow. Even when Jack's mother calls him for a special breakfast, even when he hides under the bed or runs around the yard, his Worry follows him. Suddenly, when it's almost time to leave for the concert, Jack finds it's all too much. For anyone who's ever been afraid of failing at something new, this book offers just what's needed to shrink a Worry down to size.