Autumn, 1152. A torrential storm threatens soon to smash into the busy heart of Port Sumac. Speeding just ahead of the angry clouds is the Black Crow, that famous galleon just returning from trading in the fabled Orient, its wooden belly groaning with winter supplies and other treasures. Alas! Just within sight of safety, the mighty storm drives the Crow against the rocks! With massive drops of warm rain crashing to the ground and furious winds battering the rootops, the First Captain of Port Sumac orders the Mouse Guard to attempt a rescue of the crew of the Black Crow and what cargo they can.
Beneath the furious waves, in the cold calm underwater, a hideous tentacled terror from the depths lurks; while inside the Port, a cunning and opportunistic merchant sees an opportunity to destroy the power of the Black Crow and the Mouse Guard in one fell swoop! Will the Mouse Guard save the crew? Will the mice of Port Sumac starve to death in the long cold Winter if the supplies are lost? Will the Black Crow ever spread its sail again? Will the enemy within the walls of Port Sumac triumph in villainy? Let’s find out in this swashbuckling chapter of Mouse Guard!