[sufue]

The Island of Peril is about half-way through John Creasey's Department Z series. It is a US Kindle Countdown deal at $0.99 for about 2 1/4 more days.

link: https://www.amazon.com/dp/B01KKIU8J4

Spoiler:

‘Mr. Creasey realises that it is the principal business of thrillers to thrill.’ Church Times

On a top secret island, the Germans are perfecting a paralysing gas. This gas would be able to disable an entire infantry troop, a crew of a ship, or the pilots of aircraft.

With the looming threat of this noxious gas, it’s up to Department Z to find this mysterious island, where the gas is being manufactured, and steal the formula to prevent the Germans from using it as their ultimate weapon.