Roy J. Snell 
Blue Envelope [EPUB ebook] 

First published in 1922, ‘The Blue Envelope’ is a mysterious adventure from popular children’s author Roy J. Snell. Set in Alaska, young cousins Lucille and Marian are spending the winter here working as a schoolteacher and an artist respectively. However, when a mysterious and important letter arrives, the girls have an adventure ahead of them as they must ensure it gets to the right person and doesn’t fall into the wrong hands. Full of danger and adventure, this is a thrilling tale which will charm all age groups.-