 Elderly motel owner Ethel Cary is violently assaulted during an attempted robbery of her unbanked life s savings. The evidence all points to motel guest Roger Taylor, but both Taylor and Mrs. Cary pass lie detector tests. Mrs. Cary s nephew Henry is loudly insistent that Taylor is the perpetrator and motel guest Wilbur Morgan makes a point of volunteering information and additional evidence that would seem to implicate Taylor. However, Taylor passes a second lie detector test after Mrs. Cary is again assaulted and her savings are taken. Dan Mathews deduces that Henry and Wilbur Morgan must be involved and he sets a trap by asking Henry to take a lie detector test himself.