V.I Flying Bomb
Story #16 in the collection Spy Catchers.
The year is 1938 and Bernard Newman is taking a bicycle tour of the Baltic. He is briefly detained while on the German island of Rugen before being allowed to continue. This heightened security interested him and he snoops enough to learn of the manufacturing plant for the then new V.I rocket. His report soon after to British Intelligence would help greatly when the rockets started falling on London the next year.