The Road Home — Joel Rosenberg

All Jason Cullinane - swordsman, baron, and son of the Warrior, Karl Cullinina - knew was that he had to find and stop his friend Mikyn. Mikyn, who had been his childhood playmate; Mikyn who knew all too well the cruelties of slavery; Mikyn, who had gone off on a killing rampage, seeking to wipe out all slavers single-handedly while keeping the legend of the Warrior alive. What Jason didn't know was threat the search for Mikyn would force him into a perilous pact that might prove his own ruin.