Loco Motive is the twenty-fifth in Mary Daheim's Bed-and-Breakfast series. It's $1.99 at Kindle and Kobo US right now.
Kindle US:
https://www.amazon.com/dp/B003VIWNLM
Kobo US:
https://www.kobo.com/us/en/ebook/loco-motive
And a couple of other early titles in the series are also $1.99 right now:
Fowl Play (#2) is on sale at both Kindle and Kobo US, and
Dune to Death (#4) is $1.99 is on sale only at Kindle US, at least as of now. Links and info are in
this previous post.