Hugh Drummond has lost none of his trademark wit, charm, and confidence. In investigating the mysterious death of Professor Goodman, who holds the key to a formula for creating diamonds, he uncovers a menacing plot involving the Metropolitan Diamond Syndicate and, inevitably, his seemingly indestructible enemy, the sinister Carl Peterson. Unexpected twists and turns are rife, and the climax sees a thrilling boat chase that makes for fantastic listening.
