Enter into the world of the Deptford Histories, where a long and brutal war reigns between the squirrels and bats. When the Starwife is betrayed and poisoned, Ysabelle sets out on a dangerous quest to protect the magic Silver Acorn. With the help of Vespertilio, a young bat hungry for revenge, the two must fight for their lands in this thrilling prequel to the Deptford Mice trilogy.