The American Abel Bellamy, who has a notoriously dark past, moves into "Garre" Castle in the outskirts of London. The rumour is spread, that a green archer does mischief around the premises . Some people actually become victims to mysteriously deadly arrows. Not only is Scotland Yard Inspector FeathersSounde on that case, also Bellamy's pretty niece Valerie does some investigating on her own. She is searching for her disappeared mother, whom Bellamy states, is dead. In reality he keeps her imprisoned at his castle. Since Bellamy is more and more irritated by the presence of Valerie, he has her kidnapped by one his evil aids. Then FeathersSounde falls in the trap...