This is SUCH a "boy book!" Redwall is the story of a war between the good mice (and other woodland creatures) of Redwall Abbey and the army of the evil rat "Cluny the Scourge." Matthias is the main character, and hero of the book, who is on a mission to decrypt several messages left behind by the Abbey's predecessors in order to uncover the great sword of Martin the Warrior, and therefore secure Redwall's victory. It's sort of like Indiana Jones meets The Mouse and the Motorcycle, with a little bit of Lord of the Rings (animal style) in there as well.
There are about a gajillion battles between the two sides, and several interesting side stories involving a huge snake, a band of warrior sparrows, and a vegetarian cat. I did love that one of the key characters was named Jess!
The books were jam-packed with action, and were relatively clean. There's about 5 unnecessary d's and h's here and there. Overall, though, I'd consider it a good choice for a 5th or 6th grade boy.
Even though this is the first in the author's series of many other Redwall books, I probably won't be partaking of the bounty. I'm glad to know more about the series, for the sake of my students, but one Redwall is enough for me!
For more about Redwall: