An unpopular chemist is killed by a member of his staff.
This was going to be a Wendell Urth story, but wasn’t. Just as well, since it isn’t all that good. This is another puzzle story, where the characters are all background to the real center of interest—how will the murderer be caught? Here the murder is so much like the near-murder in A Whiff of Death (since it involves mucking around with somebody’s gas cylinders) that it tends to come down in one’s estimation.