While Redwall prepares for a long siege, Cluny steals the symbolic tapestry of Martin the Warrior from within the abbey, and Matthias learns that Martin's great sword still exists - but nobody knows where. As Cluny's next attack is repulsed Matthias meets a new ally, Basil Stag Hare, and learns that his own destiny is inextricably linked to his hero Martin. Matthias will become Redwall's next protector - but only if his quest for the sword is successful.