Star Trek: The Next Generation: I.K.S. Gorkon: A Good Day to Die: A Good Day to Die, Book One (Star Trek: Klingon Empire, 1);

When Captain Klag and the crew of the Gorkon venture into the unexplored Kavrot Sector, they stumble upon a strange planet populated by the Children of San-Tarah, a powerful warrior culture, who offer Klag a challenge he cannot refuse--a series of martial contests whose winner could transform the Klingon Empire. Original.