![The Empty Envelope (A to Z Mysteries Bk 5)](https://nationalbookswap.com/pbs/m/23/2023/9780439052023.jpg)
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Dink keeps getting letters addressed to "D. Duncan." But when he opens them, they all start "Dear Doris" and don't make any sense! Josh and Ruth Rose think someone's playing a trick on Dink. But Dink is sure there's more to it than that--especially after Doris Duncan shows up and demands her letters!