Watch Lily (1986) Official Trailer

Lily Miniver is an eccentric, intrepid young woman whose job as associate curator at the prestigious Jeffersonian Museum in Washington, D.C. takes her around the globe. When a unique Aztec necklace, on loan from the British Museum, is slightly tarnished, she quickly deduces that it's a fake, and she is sent to London by her boss to determine how a substitute necklace showed up at the Jeffersonian.