Summer, 1922. Henry Wilkens burst through the doors of the emergency room covered in his wife's blood. Was he a grieving husband, or a ruthless killer who had conspired with bandits to have her murdered? San Francisco police turned to a new machine that had just been invented in Berkeley. The inventors, John Larson, Gus Vollmer and Leonarde Keeler, hoped the lie detector would make the justice system fairer. Instead the flawed device poisoned their lives, turned fast friends into bitter enemies, and transformed our relationship with the truth in ways that are still being felt. Katwala reveals the incredible truth behind the creation of the polygraph.