The Double Cross (The Travelers #0.5) by Michael P. King
This is a story of a con man and his student and the training involved for the purpose of taking revenge on his former partners. It looks like the first book in the series but it is actually the fifth book written. I didn't know what to expect but I was pleasantly surprised. It was non stop action with a bit of violence. Since it is the fifth book and practice makes perfect, I am hoping the first books are just as good.