That’s how I got into them - I bought that one for my Mum, she loved it, and read the whole series. I am trying to space them out a bit as they are bizarrely good for the soul, despite being centered around a murder. I think it was Carol who knows the town that most of the books are loosely based on, and indeed, orienteering appears at a point I haven’t yet got to!
So I just recommend to start at the beginning:
https://www.goodreads.com/series/42154-chief-inspe...Also, is anyone watching His Dark Materials? Enjoying it a lot here.