Dark Passage — Gail Z. Martin

A poisoner is loose in the caravan, and men are dying. Powerful old enemies have returned for vengeance, and Jonmarc finds honor and courage tested as he risks his life to save his friends.

Soldier. Fight slave. Smuggler. Warrior. Brigand lord. If you've met Jonmarc Vahanian in the Chronicles of the Necromancer and Fallen Kings Cycle books, you don't really know him until you take his journey.