To bend allied Command wishes to study the technology of radiodetection available to the Germans. A reconnaissance aircraft locates a radar tracking station in Bruneval in Normandy. The French resistance network "Brotherhood Our Injury" carried out by colonel Remy takes care of the locations on the ground. On the spot, the resistant ones note the number of defenders, the barbed wires, the bunkers; the presbytery shelters the guards of the radar... Surprised by a sentinel, they are made pass for walkers, offer fire to the German and leave without asking their remainder under the a little surprised glance of the smoker teuton! Information is transmitted in London.
The organization of a mission commando intended to take elements of the radar and to destroy the remainder is entrusted to Major Frost of the 1st British airborne division.

The radar tracking station is posted in top of a 90 height meters cliff, it is thus impossible to climb it without alerting the guards. The only access, by the sea, narrow and is defended by a fortified position and a machine-gun. To tackle face would be suicide. The defense of the radar itself is ensured by a network of barbed wires, heavy machine guns Mg42 and Mg34 and about thirty men. Moreover, one German company is hardly at half an hour of road.
It is thus necessary to strike extremely, quickly and right. Major Frost thus chooses a dropping in three groups: charged to dismount the radar, a second charged to neutralize the men confined in the presbytery and finally a third charged to release the passage towards the sea from where the paras will re-embark for the United Kingdom.
Engineer Cox, specialist into electromagnetic but not in parachuting is part. He undergoes an intensive training. The group of combat is ready. 118 parachutists, plus engineer Cox, embark in twin-engines, direction France.