Pamela Norwood always carries her gas mask with her. After all, John Hawthorne, her uncle and employer has always stressed the importance of being on the alert for whatever the enemy might throw at one - or rain down on one - during wartime. Even so, she is taken completely by surprise when the siren sounds ominously through the fog on the common as she makes her way home. Luckily for Pamela, in the confusion, her friend Mr. March is on hand to provide assistance. But this is no ordinary air-raid warning. For as the pair discover when they find a body lying on the common, someone has exploited John Hawthorne's fear of a gas attack to commit a very unusual murder - death by poisoned gas mask...
Originally published in 1940, this is a vintage murder mystery from the golden age of detection.