An abandoned safe deposit box in a New York City bank is opened to reveal a bundle of old letters, photographs and priceless jewellery.

Court clerk Jane Willoughby is charged with discovering more about the mystery of the box's owner, the late Marguerite Wallace Pearson di San Pignelli. Why did Marguerite never claim these most precious possessions? Who are her heirs? Are they still alive?

After arranging for the jewellery to be valued, Jane and Christie’s auctioneer Phillip Lawton are thrown together in a quest to find out more about Marguerite’s story. But neither of them could imagine where the contents of the box could lead them . . . or how it will change their lives forever.