Mariel of Redwall if one of the books in the Redwall serise (which is a great serise, the first book being Redwall)
The book is about a young mousemaid that washed up on the shose of the beach, with know cule where she is. She journies to Redwall, and there the people of redwall try to help her restore her memory. They soon learn that h=she is Mariel, son of Joseph the Bellmaker. She also learns that the ship she and her father were traveling on was atack by an evil searat. Covinced that her father is dead, she vows to find the searat who killed him and avenge her father.
Good book, full of comedy, mystery, and adventure!