A man calling himself the Jockey begins a campaign against those who he believes have besmirched the good name of horse racing , escaping conviction through lack of evidence. In a message to the press, he vows that those who have amassed crooked fortunes will have the money taken from them, whilst those who have caused loss of life will find their own lives forfeit... When the murders begin, Superintendent Budd of Scotland Yard is charged to find and stop the mysterious avenger. But is the Jockey the actual murderer?