February 1816: A race through the icy, twisting cobblestone streets of London ends inside an abandoned church -- and a horrific discovery. Bow Street Runner Sam Kelly is called to investigate the grisly murder of Sir Giles Holbrooke, who was left naked and garroted, with his tongue cut out. Yet as perplexing as that crime is, it becomes even stranger when symbols that resemble crosses mysteriously begin to appear across the dead man's flesh during...