Four of the Usual Suspects: A Pippa Langham Mystery (The Portman Creamery Mysteries)

When a popular soap maker dies in the middle of her own launch party, the girls must find out who did it. The answer seems simple. In the victim's hand was a napkin with a handwritten note: The Butler did it. They have their killer. There's just one problem; there are four butlers, each one claiming that he's innocent. Did one of them do it? Or is there more to this case?