The Rogue Crew

The Rogue Crew is the 22nd book of the Redwall series by Brian Jacques, released on May 3, 2011. It is the final novel of the Redwall series, due to Jacques' death on February 5, 2011.
This summary was posted on Redwall.org, the official site of Brian Jacques and the Redwall series:
Plot Introduction.
From Salamandastron's Western Shores, to the High North Coast, here they come. Captain Rake Nightfur, and his Long Patrol Hares, with Skor Axehound and the Rogue Crew Sea Otters. Marching boldly into a thrilling saga, singing, feasting, swashbuckling, and battling. Questing for the infamous ship Greenshroud, crewed by Searats and Corsairs, Captained by the murderous Razzid Wearat, terror of both sea and land. His aim, the conquest of an Abbey! Was there ever such a blood and thunder chase? The fate of Abbot Thibb and his Redwallers hangs in the balance. Who will be first to the gates, who can save the legendary Abbey from the clutches of a Wearat? On, to victory or death!
Plot.
After a defeat at the hands of the Rogue Crew, Razzid Wearat's seer, Shekra, tells him of Redwall Abbey, a place that he can plunder easily. He sets the course for it, killing all who stand in his way.
Skor Axehound and Rake Nightfur hear about this and they team up to kill off the Wearat and his horde once and for all. Meanwhile, the Wearat wreaks havoc on land, killing otters and Guosim shrews, all the time making his way to Redwall.
Skor Axehound has a young son Swiffo, who doesn't care for weapons and, against his father's will, joins the fortunate Freepaws. The hares that are in the Long Patrol, as well as the otters of the Rogue Crew, try to outdo one another, until Kite the Slayer finds that there are differences between them, but in order to overcome this together, they all need to look past them.
Shekra stumbles across Drogbuk Wiltud. They take him aboard the Greenshroud hoping to get directions to Redwall, until finally, Skor meets up with the Wearat's crew and Drogbuk leaps overboard. Swiffo finds the hedgehog and gives him a good bath, making him lose all of his spikes. Swiffo later gets killed by a vermin foxwho has poison darts when they are closer to the Abbey.
When the "Greenshroud" is within sight of Redwall, Dibbun babies spot it from the top of a tower, and when their caretaker comes to get them she notices the green-sailed ship on its way. She warns the Abbot, while Skor and Rake find their way there. When they arrive, the Wearat is defeated by Jum Gurdy, the otter cellardog, andPosybud, a young hedgehog. The vermin crew is slain.