Ambrose the mouse longs to follow in the tradition of his mouse family and help to build the cathedral. However, his mouse cousins tease him because he has been too busy daydreaming to practice the somersaults that startle the tired workers and help them to stay awake. Ambrose resolves to not only help build the cathedral, but to help William the Master Builder find his dream. Join the adventure as Ambrose discovers a way to help William and prove to his mouse cousins and to himself that he can be of value in the building of the cathedral. With lavish, detailed illustrations by award-winning artist Katalin Szegedi, this story will teach children ages 4-10 about the architecture of a medieval cathedral and inspire them to pursue their dreams.