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Join Nancy Clancy in New York Times bestselling team Jane O'Connor and Robin Preiss Glasser's fourth Nancy Clancy chapter book about the past, present, and future! Nancy and her best friend, Bree, must go back in time to solve their latest mystery. While Nancy's class learns about time capsules in school, another relic from the past pops up in the present. Nancy buys an old desk at a tag sale and soon finds out that someone left behind a key. In the perfect follow-up to Nancy Clancy, Super Sleuth; Nancy Clancy, Secret Admirer; and Nancy Clancy Sees the Future, Nancy and Bree set out to unlock the secret of the silver key in the hopes of finding some treasure along the way. But unlocking the mystery soon proves to be more difficult than they had thought, and when the answer isn't what they had expected, Nancy and Bree learn there are some things that remain timeless forever.