Deal With The Devil, Volume 1 — Mike S. Miller

From the press release:
DEAL WITH THE DEVIL is the story of retired FBI agent Anthony Goodwin who receives an
unexpected visit from "the one that got away" - a man known as the "Red Letter Killer" who destroyed agent Goodwin's leg and vanished years before. But things have changed, and Goodwin's worst enemy needs his help to stop a copycat killer who has kidnapped his sister in an attempt to bring the original killer under his control. "One of the best things about DEAL WITH THE DEVIL is that you never know what's going to happen next," said Miller. "It's full of twists and turns, with a lot of suspense, and the ending came as a surprise to everyone involved in the project.