Cozy mysteries are really of two types: Novels in the traditional cozy style whose main emphasis is a mystery and its resolution (e.g., Agatha Christie, Dorothy L. Sayers) and novels in the more modern cozy format, whose main emphasis is on social interactions (primarily between family, friends, and coworkers) with the mystery being a smaller component of the exposition. This is definitely a cozy in the latter form. Remove the additional social interactions, and this mystery could be presented in a novella or even a short story, although not as interestingly.
If you find modern cozies appealing, you will certainly find this an interesting book. Here, self-assured Judge Deborah Knott finds a dead worker while visiting the annual Harvest Festival Carnival. The reason for this death and the identity of the killer is the primary mystery. The preface provides a family tree of the Knott family, which is absolutely needed, as the Knotts are a large family, many of whom are presented in this novel. Readers will find themselves frequently referencing this chart to keep track of Knott family members. Fortunately, the number of carnival workers and additional characters is relatively small, but it may still pay to keep some brief notes of who they are as you read. There is also an informative addendum with a glossary of carnival terms, e.g., "cutting up jackpots", "plush", "rake `em and scrape `em" that are used in the novel.
I felt the story started somewhat slowly, but it quickly caught my interest, and as events unfolded it became harder to put down. Although the story is told in the first person, in terms that will probably appeal mostly to female readers, e.g., there are probably more descriptions of Judge Knott's clothing choices than would interest male readers, this novel should none-the-less appeal to both sexes.
The novel reads quickly and easily, and provides a very enjoyable way to relax.