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This is the second story by Lithuanian writer Ignė Zarambaitė about the postal mice Berta Longhair, Ludvik Mokrenky and Goya, who has no surname yet but dreams of getting one one day. Seeing that not all the townspeople are happy, the funny mice decide to help them. At first, not all of their plans are successful, but that only makes it more interesting and fun."

Readers and literary critics have already praised Ignjė Zarambaitė for her books for children and teenagers: "Else and the Secret of the Old Manor, Grandpa's Magic Boots, The Rag Doll, The Blackwater, Emil's Letter. The literary fairy tale "The Secret Agency of Letter Writing" describes new adventures of the clever mice we have already met in the book "Emil's Letter", but both stories can be read out of order. The book is illustrated with colourful illustrations by artist Greta Alice.