Bill has been asked to do lots of strange things, and asked to solve lots of unusual problems, but this time he's going to show us how to fish. Not the kind of fish you're thinking of. The fish Bill is going to catch is a man - a big and important man. It's one thing to catch a fish when he's hungry and will take any kind of bait on almost any kind of hook. But when the fish isn't hungry or even interested, that's when the science of fishing really has to be used! The man Bill is going fishing for is vitally connected with national defence...