FYI, 12 (so far)
Agatha Christie Mysteries from William Morrow/HarperCollins are $1.99 each!
And Then There Were None
Endless Night (Queen of Mystery)
Murder on the Links (Hercule Poirot series Book 2)
Murder on the Orient Express (Hercule Poirot series Book 10)
The ABC Murders (Hercule Poirot series Book 13)
Murder in Mesopotamia (Hercule Poirot series Book 14)
The Clocks (Hercule Poirot series Book 34)
Elephants Can Remember (Hercule Poirot series Book 37)
The Monogram Murders: The New Hercule Poirot Mystery (Hercule Poirot series Book 42)
Cards on the Table: Hercule Poirot Investigates (Superintendent Battle Book 3)
The Body in the Library (Miss Marple Mysteries Book 3)
A Caribbean Mystery (Miss Marple Mysteries Book 10)