Astrid and Anna take a break from tales of espionage to bring you one of international cooperation. Developed by a small group of highly driven individuals working in top secret, Proximity Fuzes are the new Allied super weapon changing the face of warfare forever. They're just one of many impressive new developments which are helping the Allies win the war. Defeating the Axis is a righteous cause of course. But at its core, so much of our scientific progress is in the service of finding more effective ways to kill one another. What does this mean for our future?

What did the RAF and Luftwaffe think of each other's toys? Who were the Zirkus Rosarius and the RAFwaffe? And what happens when American and German engineers team up to save the Luftwaffe's wonder weapons? Deception, trickery, and subterfuge await once again in another instalment of Spies & Ties.