A foreign diplomat is found dead in Washington, D.C., with no signs of forced entry, no witnesses, and no apparent motive. But buried within a single encrypted chat app on a burner phone was a string of emojis, time-stamped and meaningless—until a cryptographer uncovered their deadly significance. In this episode of Case Cracked: The Clues That Led to Justice, Ronan Wolfe follows a trail of symbols, steganography, and a killer hiding in plain sight.