"A thrilling account of the creation of the so-called lie detector, exploring shocking murders and dramatic trials to uncover the true nature of the polygraph"-- 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....

"Harriet Wermer investigates more mysteries during her stay on Marble Island"--