<p>The Man Who Was Thursday: A Nightmare is a novel by G. K. Chesterton. The book is sometimes referred to as a metaphysical thriller.<br><br>In Edwardian era London, Gabriel Syme is recruited at Scotland Yard to a secret anti-anarchist police corps. Lucian Gregory, an anarchistic poet, lives in the suburb of Saffron Park. Syme meets him at a party and they debate the meaning of poetry. Gregory argues revolt is the basis of poetry. Syme demurs, i...