Try these mysteries . . .
Navada Barr series featuring Anna Pigeon, a national park ranger. Each book takes place in a (mostly different) park. First book in series is Track of the Cat.
Sarah Andrews series featuring geologist Em Hansen. First book in series is Tensleep.
The MCC Library does not own these mysteries, but they can be borrowed from other libraries. Ask at the Reference Desk about how to place a hold on these and other titles.