With Allied bombing operations stymied by mysteriously improved German radar capabilities, Col. Gallagher becomes involved with a multi-national, multi-service commando mission aimed at knocking out the enemy facilities and stealing the technology for study. The undertaking is put at grave risk, however, by a combination of poor coordination between the different units involved, Nazi spies, and the reluctant participation of a key expert, Captain Deel, who happens to be a problematic acquaintance of Gallagher's from his past. And now Deel is having a fling with the sister of an important British officer involved in the task who is not at all happy about it.
