I had fun with this book, and even though it was fourth in the series, I had no difficulty in following the characters. Mrs. Pargeter is a widow. Her much-beloved husband was in business, and it's not long before the reader discovers his business was criminal in nature. Because he was such a nice guy, there are many crooks around who would do anything for Mrs. Pargeter. It's charming that these former (mostly) criminals are so willing to be at her beck and call.
Mrs. Pargeter's friend, Kim, is eagerly looking forward to the release of her husband, but she's worried he won't find her attractive, since she's gained weight in the years he's been gone. Mrs. Pargeter checks them both into Brotherton Hall, a health spa that will help Kim get in shape for her husband's return. (Mrs. Pargeter thinks Kim looks fine as she is, but she wants to help.)
Once there, the giggles keep coming. While Kim works her butt off and exists on lettuce and cottage cheese, Mrs. Pargeter makes arrangements for a special course treatment to deal with her "allergies", which includes steak, good wine, and the option to avoid all exercise. She can do this because the owner of Brotherton Hall is a former colleague of her husband, as is the spa's chef.
After overhearing some disturbing conversation, she witnesses two orderlies wheeling out the body of an extremely thin dead girl. Mrs. Pargeter makes up her mind to find out what's happening.
Alongside the mystery, Brett gives a humorous commentary about the manipulative methods used by weight-loss gurus to guilt women into using their product.
A fun read.