Jason Grant learns his real father was killed years ago by the ruthless Tuborg, and that he was raised by his father's friend. He also learns he has a twin sister raised separately from him so as to make it harder for Tuborg, relentlessly tracking them down, to find them. His foster father killed, Jason travels to London, buys a motorcycle and begins his search for his sister, whose name he finds out is Geradine. He is unaware Tuborg is hot on both his and his sister's trails. The three sides all come together on a ferry ride across the English Channel.