Miss Marple by Agatha Christie

 (audiobooks)
Murder at the Vicarage
The Body in the Library
The Moving Finger
A Murder is Announced
They Do It With Mirrors
A Pocket Full of Rye
4.50 From Paddington
The Mirror Crack'd From Side to Side
A Caribbean Mystery 
At Bertram's Hotel (not audio)

Nemesis
Sleeping Murder

The Tuesday Club Murders (short stories)