The fourth book (5th when novella included) audiobook is now available. 'Murder at a Wimbledon Mansion' includes another murder mystery for the awesome foursome to investigate! With Lady Marjorie Snellthorpe at the helm when the four octogenarians accept an invitation to stay in a mansion house, there are served up more than tennis.

You can get the audiobook from retailers around the world, including:
Chirp Books: https://www.chirpbooks.com/audiobooks...
Google Play: https://play.google.com/store/audiobo...
Nook: https://www.barnesandnoble.com/w/murd...
Kobo Walmart: https://www.kobo.com/us/en/audiobook/...
Libro.FM: https://libro.fm/audiobooks/978191306...
Binge Books: https://bingebooks.com/book/murder-at...