High Rhulain

High Rhulain is a fantasy book written by Brian Jacques in 2005. It is the eighteenth book in the "Redwall" series, and was also translated into French and Russian.
Plot.
A young female otter named Tiria Wildlough is living at Redwall Abbey. When she gets a vision and riddle from the long-dead hero Martin the Warrior, she sets out with a hare named Cuthbert Blanedale Frunk in search of an island called Green Isle to fight an evil wildcat and lead a bunch of otters to freedom.