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Carolyn Keene
Carolyn Keene is the pseudonym of the authors of both the Nancy Drew Mystery Stories (and a spin-off called River Heights) and The Dana Girls Mystery Stories, both produced by the Stratemeyer Syndicate.
The Key in the Satin Pocket
Synopsis
When Nancy tries on an old brocade jacket in a vintage clothing store with Bess and George, she finds an old safe-deposit box receipt in the pocket and a key sewn into the lining. Soon the girls are tracing items from an old estate scattered in antiques shops across town—and are immersed in a mystery involving long-lost relatives, a missing will, and a hidden fortune .