It is 1914. From the jungle at the heart of the Belgian Congo emerges a British manservant named Garvey. He is the lone survivor of a mining expedition in which both his masters have died, and all of the party's African porters have fled. With him, he carries two huge diamonds. From his prision cell in London, Garvey recounts his horrorific and thrilling ordeal. Young Tommy Thomson must transcribe Garvey's story and only he can unpick fact from fiction amidst the extraordinary mysteries of the Garvey case.