Unfortunately, she's not well known in the United States, although she deserves to be.
You can't help making some comparisons between Kinsey Milhone and Grace Smith (Liz Evans's PI) -- both are basically loners who have a few close friends, both are tight-fisted, are careless about their clothes and personal appearance, and both live in the margins, without family ties to speak of. But Grace Smith is very much her own character -- she's funny, sharp in her comebacks, has an edge to her, and inhabits a very different world from a wealthy California coastal town. Grace lives in a seaside town in England -- a town that used to be a resort but now only gets weekend visitors. And Liz creates a world around Liz that seems real -- like you've been there and can see it all, see the people, see the greasy spoon restaurant she's always cadging meals at, see the lonely beach off-season.
This story is about a donkey -- Marilyn Monroe -- who is killed. The police don't want to waste time on this, so the donkey's owner hires Grace Smith to find out who killed Marilyn Monroe. Grace is no fool and suspects it may be tied to a killing of a human that happened about the same time in the same general area -- and so her investigation follows that line. She quickly discovers who was killed (the police don't have a name yet) and begins to investigate who that person was and what the motive was.
My only regret is that I have only one more book to read in the Liz Evans series. I hope she keeps writing them, and I hope these books become more readily available in the U.S. so that others can get to know Smithie and her sharp British wit.