From Super Detective Picture Library #183, October 3, 1960.
In the early summer of 1944 as plans for the Invasion have been worked out, the Gestapo and the SS in occupied France are hard at work rounding up Resistance operative who will be needed to confound the Germans when D-Day comes. A few traitors in the Maquis are at fault and John Steel is sent into occupied France to go on a traitor hunt.