The Midnight Man by D.C. Hamilton

6.10

When Grady, an assassin with a genetic disorder that renders him unable to feel pain, is sent on a high-stakes assignment, his world is turned upside-down after an attack when he awakens to discover that he can feel pain for the first time in his life. With the clock ticking and his greatest asset gone, Grady will go head-to-head with his greatest fears and unspeakable enemies, while experiencing a tactile world he never could have imagined.