Ripley Hilliard is an inquisitive 13-year old. He has a brilliant analytical mind fueled by two years spent reading detective novels and crime stories while recuperating from a bad accident. He yearns to be a detective but few people will take him seriously. At school, because he is both small and very smart, he gets bullied and he is insecure about girls - particularly about Madalyne, on whom he has a major crush. When a world famous black diamond, the Star of India, is stolen from the museum where Madalyne's father is the curator, Rip is determined to solve the crime. Not only will he then prove his skill as a detective and collect the 20,000 pounds reward but he may also impress his favorite girl. Rip is confident he can solve the crime, but what adult would believe him? If only he was a real detective and not just a kid. While researching on the jewels Rip meets Grant Logan, a down on his luck actor who dislike children and whose only claim to fame is to have played a ...