Mr. and Mrs. Mouseling are going to the grown-ups-only costume ball, and Angelina’s determined not to miss the fun! So she and her best friend, Alice, find a way to sneak in and fool all the adults. But can the two mouselings remain undiscovered, or will they somehow blow their cover?Mr. and Mrs. Mouseling are going to the grown-ups-only costume ball, and Angelina’s determined not to miss the fun! So she and her best friend, Alice, find a way to sneak in and fool all the adults. But can the two mouselings remain undiscovered, or will they somehow blow their cover?