It's 1965 in the nation's capital, a banner year for the prestigious National Geographic Society. The first-ever National Geographic television special will air in the fall, and an exciting new exhibit, "Headhunters of the Amazon," will soon open in the Society's museum, Explorers Hall. However, just as Washington's famous cherry trees burst into bloom, tragedy strikes. A senior member of the editorial staff, a talented but unpopular woman, is found murdered in her office in the Society's swank new headquarters. Most startling of all is the way she was killed.