"Kreeft takes the reader through the world of existentialist philosophy, posing questions that challenge the concepts that Sartre proposed. Based on an imagination dialogue between Socrates and Sartre that takes place in the afterlife, this profound and witty book makes an entertaining and informative exploration of modern philosophy. "Peter Kreefts work is (1) unfailingly brilliant, (2) intellectually agile, (3) astonishingly perspicacious, (4) gloriously orthodox, (5) Chestertonian aphoristic." - Thomas Howard, author of On being Catholic"--.