Solid and solvable This was a good solid mystery, lots of suspects. I don't know if they really explored opportunity that well, more focused on motive. For me, the mystery seemed almost too easy, I didn't have a hard time guessing who did it. Acting was good as usual location was beautiful. The victim was not very likable, almost satisfying to see her get bumped off.
Spoilers ahead...
This was the old killer confesses, but then finds out. Oh, I didn't really kill her, but he'd really killed her earlier. This has been used more than once in mysteries like this perhaps I've just watched too many I found it easy to guess.
I don't know why the killer confessed at the end. A detective with decades of experience has told me that experience criminals, anybody who's done any real time never confess, unless, of course, maybe it's part of a plea, bargain deal and they're getting a lower sentence. But them this is just fantasy.