Felix Jones is The Keeper of The Book of Words. The Brethren's search for The Book brings danger and adventure to Felix and his best friend Tom. Determined to end The Keeper's age old enemies' quest for power, the boys travel back to the Dark Ages in search of the first Keeper, hoping he can provide the answers they seek. The Book and Merlin teach them important lessons of the responsibility Felix now has if he is to fulfil his role as The Keeper.