These are dark times for the Mouse Guard, defenders of the mice from the travails of the world. The scent borders have been breached, and the weasels roam free across the territories. Gwendolyn, bold leader of the Mouse Guard, is missing, presumed dead, and Lockhaven sits under siege.
But out of nowhere, hope emerges. A wandering band of mice return, from a mission deep within the weasel lands, with a secret that just might turn the tide and save the mouse-kind everywhere.