From the Back of the Book: What if everyone around you were a doppelganger... and only you didn't know? The Complete Guide to Doppelgangers is a stand-alone, world-neutral sourcebook covering everything you ever wanted to know about doppelgangers. It includes: The true origin of these bizarre creatures. Background on doppelganger social structure, including their various life stages and their relationship to mimics. Details on how the doppelgangers have penetrated human society. New feats and skills for doppelgangers, plus the dreaded Protean Warrior class. Unique campaign ideas centered around doppelgangers. New monster stats for intriguing variations on the standard doppelganger. Supplemental material online.