Dive into the chilling case of Israel Keyes, a prolific serial killer whose victims remain shrouded in mystery. A blood-drawn skull map found by the FBI hints at the horrifying extent of his crimes. Join Peter Van Sant of "48 Hours" as we unravel this complex case. Will the truth ever fully emerge? Watch now and uncover the secrets of one of the most perplexing serial killers in history. #48hours #crime #mystery #truecrime