"#1 New York Times, #1 Wall Street Journal, and #1 Publishers Weekly bestselling author Brad Thor is back with his most gripping thriller yet! In ancient texts, there are stories about men who struck from the shadows, seemingly beyond the reach of death itself. These men were considered part angel, part demon. Their loyalty was to their families, their friends, and their kings. You crossed these men at your peril. And once crossed, there was no crossing...