The Broken Blade, The Knight of Eldaran Series #3

Eamon Goodman is now the Master's Right Hand. But despite being the second-in-command to the ruler of the River Realm, Eamon becomes the victim of vengeful plots engineered by the other Quarter Hands. Eamon finds himself powerless to stop them and the people he cares for are under threat. Eamon then discovers that the Nightholt – the book he long ago delivered to the Master's Hands – holds the key to the Master's power, which will become absolute upon the death of the King. Thus the stage for the final battle is set. Eamon rides out at the head of the Master's army and must finally decide where his true allegiance lies. His choice will determine the fate of the River Realm…