What is the author's style in The Guernsey Literary and Potato Peel Pie Society by Mary Ann Shaffer?

The language used in this novel tends to be generally casual and informal, and any deviation from this results from the time period and location about which the story is written. The novel is written in an epistolary format as a collection of letters and telegrams, mostly between Juliet Ashton and her friends or members of the Guernsey Literary and Potato Peel Pie Society. The sentences are constructed properly and in adherence to grammatical rules, which is important since the story is a collection of letters often between people who do not know each other well or who have a business relationship. This formality, in conjunction with the casual language used, aids comprehension for the reader.