Hank Janson - Deadly Mission

Published by Alexander Moring in December 1955. Cover art is probably Reginald Heade. After the Hank Janson court case, Heade stopped signing his work, therefore positive proof is impossible, but Steve Chibnall labels it as 'probably by Heade' in his work "Reginald Heade - England's greatest artist" - and that's good enough for me!!