Dr. Andrew Gordon is an orderly man, and the women who work in his office can predict his movements as regularly as clockwork. So when Grace Spencer enters his office, she expects him to look up and smile, as he does every time she walks in. But this time he doesn’t raise his head. Dr. Gordon is dead. Though he was bludgeoned in his office, just a few feet from where his nurses were working, no one was seen entering or leaving. It’s an impossible murder, and it will take more than a doctor to stop this kind of sickness. Pamela North spots Lt. William Weigand on his way to the crime scene, and she can’t resist tagging along. The doctor’s death is no medical mystery, but this case will be solved thanks to one of the great marvels of the twentieth century: the collective minds of Mr. and Mrs. North.