Due to the war, there was a great shortage of food and basic amenities. The islanders make the best of this situation, by scrimping, sharing and being really creative with the way they use their resources. The situation is worsened by the starving German soldiers who grab whatever food, drink, soap, blankets, etc they can get their hands on. At the height of war-time, this miniscule island is almost forgotten by mainland England, and with no supplies reaching them, things are really hard. Even though the situation looks bleak, the mood is not pessimistic. The islanders are good, strong, simple folk, who help each other, rally around, and keep the group's spirit flying high. One of the ways they do this is by starting a literary society, which meets often (and secretly) to read and talk about their favourite books. They are enthused enough to start writing too.
The best part is, the entire book is in the form of letters, much like another wonderful book, Love Letters, by AR Gurney. Through letters traveling between the various characters, one gets personal insights into the nature of people's lives, loves and human nature. The letters gradually unravel the story, bringing forth the characters of people, and the incidents that occur. Though a work of fiction, the authenticity makes it seem like non-ficiton.
Most heartening are the little things that give people joy in hard times, and how human contact is so essential to us all. One realises the value of the 'softer' things in life, such as literature in this case, and why we need it as human beings. We take it for granted till it is denied to us. The book is reminiscent of a wonderful quote by Albert Camus, "In the midst of winter I finally learned that there was in me an invincible summer."