They Do It with Mirrors, Paperback/Agatha Christie

The Queen of Mystery has come to Harper CollinsAgatha Christie, the acknowledged mistress of suspense--creator of indomitable sleuth Miss Marple, meticulous Belgian detective Hercule Poirot, and so many other unforgettable characters--brings her entire oeuvre of ingenious whodunits, locked room mysteries, and perplexing puzzles to Harper Paperbacks... including They Do It with Mirrors , where Miss Marple investigates some rather deadly doings at a rehabilitation center for delinquents.