Where there is adventure, generally there is danger! Biff Brewster has had enough of both to know this well-but in spite of his thrilling experiences in Brazil, Hawaii, and China, he is hardly prepared for the treachery and intrigue awaiting him in Mexico. Biff's father has been called to Mexico to act as consultant to a group of archaeologists who are searching for what may prove to be one of the most fabulous treasure-houses of Aztec antiquities uncovered to date. But a weird and shocking telephone call brings early warning to the Brewsters: trouble ahead! More than once, Biff and his friend Miguel must pit courage and ingenuity against possible disaster. A talking statue, a legendary war god, a rare fire opal, a dagger, and a mask-all become forces of destruction which threaten the lives of everyone involved in the hazardous excavation. Obviously, someone else is in search of the treasure, someone who will stop at nothing to claim it for his own evil purpose.