You are commercial pilot holidaying in the UK when a friend asks you to fill in as pilot for a day at Wick airport. The company pilot, Captain Ron, has a broken arm and so can only be co-pilot. It is early morning, the weather is getting worse – but it's just a short delivery run .. or is it. And then comes the coded message and there is the top secret black box, the smugglers, a professor, a few rowdy soldiers, a DC3 and a Grumman.