These twelve short stories of detective work in the realm of disease are highly recommended to physicians, health officers and laymen alike. They are not only written in a lively and skillful way with all the interest and suspense of mystery tales, but they are well and truly told with a simplified scientific approach. They all appeared in the New Yorker between 1947 and 1953 and aroused interested comment in medical circles; now they are in book form. They deal with actual problems of diagnosis and epidemiology, many of which got into the papers and which were solved by a combination of intelligence and fortuitous circumstance, just as in detective fiction. There are in addition well written little essays on the among problem and on the intense search now going on for antibiotics. The book will give the layman an insight into the modern machinery of disease investigation and control, and the medical man will find epidemiology treated from an unusual angle.