The man who was Thursday - G. K. Chesterton

A surreal masterpiece and a psychological thriller, Chesterton's classic novel brings into question the very meaning of identity The Supreme Anarchists Council is dedicated to overthrowing the world order. To keep their identities a secret, each of them has been named a day of the week. Gabriel Syme, an eccentric poet, is recruited by Scotland Yard to infiltrate the group. He tracks down the six men and manages to win a place on the council as 'Thursday'. But in a bizarre and surreal twist of events, Syme realises that five of the six members are not at all what they seem...