The Care and Management of Lies by Jacqueline Winspear

The Care and Management of Lies is a beautiful story of the love and friendship of three people and how those lives were forever altered by World War I.
Kezia and Thea met in school and became best friends. Kezia marries Thea's brother, Tom. Thea becomes active in the suffragette movement and is convinced that Kezia is going to have a difficult time being a farmer's wife.
As the war begins, Tom sees that many of the men who work on his farm are enlisting.  Thea volunteers as an ambulance driver to avoid being arrested for her war protesting activities. Kezia is left to keep the farm running, with an old man and a lame boy to help her with the work.
Kezia keeps the farm running and makes everyone around her feel loved and cared for. Her letters to Tom are filled with her cooking that she cooks for him at home. These letters are read by Tom to his men who feel her love for Tom and give them something to think about besides the mud and rats and death that actually surround them. 

There is no gratuitous violence and the characters are complex and well-drawn. 

I listened to this as an audio-book and the reader's voice was perfect for it.  

A really good read or listen.