Gallagher and his team have gained access to the German underground but their entry has been discovered.

The team has been briefed and they all recognise the importance of their mission and that their chances of survival are limited.

The team is given a detailed briefing for the attack on the bomb dump but one of team opts out and the operation faces failure.

The deadline for the official selection of the team approaches but tempers flares and quarrels begin.

Major Gallagher discovers a way to cross the minefield which surrounds the German bomb dump.

The team are employed into a real operation in France but Portales loyality is in question.

The team may have found a way into the V1 storage dump.

Parachute training begins, and there is suspicion there might be a secret agent.

As the training continues, they emerge as individuals.

The selected recruits are to meet at a designated rendezvous.

A special team has to be selected for the operation.

Part 1 in this serial about Hitler's secret weapon against Britain.