Newly inducted into the Order of the Bat'leth, an ancient brotherhood Chancellor Martok has restored to its founding purpose of policing Klingon honor, Captain Klag of the I.K.S. Gorkon has sworn to the Children of San-Tarah that the Empire will leave their world untouched. When his rival General Talak orders him to break that oath and help conquer San-Tarah instead, Klag must choose between the chain of command and his given word. A Star Trek: I.K.S. Gorkon novel.
Summary by Loreful, from public sources