Here's a thread to discuss this month's Book of the Month. Have you read Parker Pyne Investigates? When I first read the book, my 1990's edition did not include two additional short stories that appeared in The Regatta Mystery and Other Stories. The current edition contains every Parker Pyne story.
Notice how the book stories are divided– The first several stories are about unhappy people who visit Pyne's office in the hopes of finding love or fulfillment. The last several are more traditional mysteries– murders, theft, and kidnapping– occurring while Pyne was on vacation. The two newly added stories are one jewel theft, and another "heart problem" on vacation.