The characters Doctor PERSON@1 and Mister PERSON@2 in PERSON@3 's thriller Strange Case of Dr PERSON@1 and Mr PERSON@2 represent an exploration of the concept that good and evil exist within one person , constantly at war .

For example , in The Strange Case of Dr PERSON@1 and Mr PERSON@2 , Mr. PERSON@2 was Dr. PERSON@1 's evil alter ego -LRB- same person , different personalities -RRB- .
