Mary Roberts Rinehart is good
As for the original question, what mystery authors can be converted: I just finished reading Mary Roberts Rinehart's "The Man In Lower Ten" and I've also downloaded "The Circular Staircase". Her stuff is GREAT --- I remember her name from my high-school reading. Surely there must be more of it that can be found?
She wrote in the 19-ought-something time period, so it should be fair game.
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