The Adventurous Four

I don't know about you but adventure stories have always had an appeal and two wonderful books in the series The Adventurous Four set off the Scottish West coast where four children with the oldest Andy aged 14 who's acquired already a good knowledge of the sea, islands and sealife is  helping his Dad,  encounter Nazi's thieves and gunrunners.
The series is very much set in Wartime arguably more so than any other of Enid Blyton's work and sees them taken prisoner by the Nazi's resolving to show them what Scots are made of.

These are my copies in the Deans Rewards series from 1973 where as with a few other series such as the Famous Five, the skirts and shorts worn by the children in the original  covers are replaced with Jeans although we all know children during the War never had Jeans!