The French Resistance spot a new German weapons base being developed near Calais. Their sabotage attempt goes badly wrong while a Bomber Command mission also proved unsuccessful. SOE decide this needs a trained unit.

Gallagher hands over his new unit to Lt. Col. Squires to begin their training. Scientist Stephen Lovell might be the most vital person on the mission but the army intend to play hardball with him.

The date of the mission is pushed forward when SOE receives new intelligence that the Germans could have up to 14,000 rockets. Final selection is held before paratroop training begins in earnest.

After a successful first mission, the unit get debriefed; McKenzie is carpeted for his actions while Gallagher has to inform Simone's mother of her tragic death. Tightrope walker Soltysyk 'Warsaw' is recruited.

The unit enters France and discover, from Pierre, that the invasion is a mere two days away. The group head to the German rocket base in Deauville. An RAF bomber raid causes the power to go out, allowing the unit to get in.

The unit have reached the heart of the rocket site. The German kommandant has been made aware that at least three men are on the premises. The group find the documents and plant their bomb but have just sixteen minutes to escape.