July 1910: a Scotland Yard inspector disguised as a river pilot boards a transatlantic liner and arrests a mild-mannered passenger. Dr. Hawley Harvey Crippen becomes the first criminal in history captured using the wireless telegraph. A century later, DNA suggested we may have hanged the wrong man.

This deep dive into the Crippen case shows how cutting-edge technology can deliver a suspect to justice while flawed forensic certainty creates lasting doubt. We trace the love triangle, the cellar torso, the famous ocean chase, and the 2007 test that reopened one of history's most notorious murders.

• Crippen nearly got away after a detective believed his story, but his panicked flight with mistress Ethel Le Neve reignited suspicion.
• His quicklime cover-up backfired chemically: damp soil turned it to slaked lime, which preserved ...