More than four seasons have passed since Mariel the Warriormouse and the rogue mouse, Dandin, set off from Redwall in search of adventure, and Joseph the Bellmaker is worried. Where is his beloved daughter? Joseph's answer comes to him in a dream, and soon he's off, accompanied by the intrepid Finnbarr Galedeep and the brave crew of the good ship, Pearl Queen, to save a kingdom and rescue Mariel. But what's behind the riddle in the dream? Can Joseph guess its meaning and find his daughter before the dreaded Foxwolf, Urgan Nagru, plunders the kingdom of Southsward? Can this be the end of Mariel the Warriormouse?