I *love* Tana French and heartily second that suggestion! Other possibilities: the Maisie Dobbs series? The No.1 Ladies Detective Agency series?
Lorne ,'Why We Fight'
Literary Buffistas 3: Don't Parse the Blurb, Dear.
There's more to life than watching Buffy the Vampire Slayer! No. Really, there is! Honestly! Here's a place for Buffistas to come and discuss what it is they're reading, their favorite authors and poets. "Geez. Crack a book sometime."
Oh, C. S. Harris!
Hm, that Goodreads list mentions Ben Aaronovitch which I wouldn't have thought of because they're fantasy but they are also good mysteries.
And I want to validate that Louise Penny is a good choice.
Oh, shoot, that one that I confuse with the other one...I talked about it here...just the one book but it's got a very Modern Classic vibe, I will keep trying to remember
Alex Pavesi The Eighth Detective. I found it by remembering that the author was a mathematician and then it came up as the first hit.
Here's the Goodreads list of Best Mysteries of the 21st Century" for ideas.
From that list, I'd say both The Curious Incident of the Dog in the Night-Time and The Kite Runner would be considered modern classics. Also, anything by Flynn.
I'm not good at guessing what will stand the test of time, but I really liked Jane Harper's "The Dry".
If this was the basis of the recent Australian movie with Eric Bana, I'd second this. The film is great.
Megan - I haven't seen the movie version. Will have to look for it. I also recommend Harper's "The Lost Man".
Third to Tana French.
Seconding Laura Lippman.
I liked both those Jane Harper books too!
I love Deborah Crombie's series, and you could liken her to Louise Penny.