The Defender of Rebel Falls (The William Whitehall Adventures, #1)

The pen may be mightier than the sword, but William Whitehall knows which one feels better in his hand. As a librarian—a reluctant one—his reports catch the eyes of a powerful nobleman, who selects William for an important mission. As he faces danger after danger, he soon realizes that having the right weapon is one thing, but having the wits to use it is quite another. Because when he faces his ultimate challenge, it's more than just his own life at stake.