Alice Munro is (and I think there's a consensus on this) the greatest living writer in English. Though there are hits and misses among her stories, there is a huge majority of direct hits.
It would be wrong to say that she has become darker. She always believed in a good look at the worst. But she has certainly, in her later work, taken literary subtle difficult fiction into the terrain of the thriller and even horror writer. It's a combination few others have tried.
The Love of a Good Woman, for all its beauty, is one of the most horrid and frightening stories I have ever read - as confirmed on a recent admiring unwilling re-reading - what on earth is going to happen after the end of that story?
The same can be said of Save the Reaper with its hints of wild depravity.
Jakarta and The Children Stay show the long after-effects of the freedoms of the 60s and 70s on the survivors of those decades in a way that is both forgiving and unforgiving. No-one like Munro describes how long and strange life is so poetically, uncomfortably, believably.