From August 25, 1963, and reprinted in QED as “Murder Dept: Half a Clue,” this is another standard story of murder and three suspects, the culprit tripped up by one telltale sign which Ellery sees before anyone else.
Interestingly, the cousins lacked some basic medical knowledge. The story opens with Ellery making a quick visit to the neighborhood pharmacy to pick up some antibiotics prescribed to his father for “some virus to other.” It’s hard to imagine such a mistake, a conflation of bacteria and viruses, being made today!
Reading Ellery Queen 