Who Killed Darius Drake?

Arthur "Bash Man" is the school thug, paid with candy to bully and threaten other students. When genius orphan Darius Drake employs Arthur to help him discover the origin of a suspicious threat, written in blood, they uncover a mystery that involves Darius's estranged grandfather, who was imprisoned for forging evidence in a search for a long-lost diamond necklace worth millions. The boys make the dangerous decision to search for the jewels themselves -- and in the process, they discover that the car crash that killed Darius's parents was not an accident at all. Who will be next? Where are the diamonds? And who is stalking the boys?