Revenge on the Camino Tres is the third and final book in a trilogy spanning the Camino de Santiago and featuring FBI Agent Ward Crimmons. After recuperating from an illness in a hospital in Santiago, Agent Crimmons learns his granddaughter has been assaulted. He rushes back to the States and discovers the attack was retribution against him for helping Spain's police. He then returns to Spain determined to locate the man who hired the hit. Action unfolds against the backdrop of the famous pilgrimage route and Spain's complicated history. Final days of his walk find Crimmons in the midst of a violent clash between Spanish authorities and a Galician drug gang.