In an English Village and an American City life goes on as normal. It is summer and the sun shines down on people going about their business and enjoying themselves. Then a choking, yellowish smog begins to creep along the ground. A car crashes, with the driver incapacitated by the eye-stinging, killing miasma.

Dr. Palfrey and Z5 deploy and hunt the mysterious Professor Storr across the world in order to head off the threat. One mystery follows another and a fantastic, yet disturbing light is shined on a problem that is all too real ...