The new volume of the Eisner Award-winning Mouse Guard series continues! Celanawe, honor-bound by his loyalty to his Guard Matriarch, accompanies Em, his only living relative, to Port Sumac. There they find a mouse just brave (or crazy) enough to take them across the sea and beyond the record of any map. This long sea voyage gives Em the time to explain to Celanawe about her instance for the journey and how their fates will forever be tied to the Black Axe.