"A hilarious novel about people's existential agonies, a page-turner about the intellectual mysteries that obsess them… deeply moving and a joy to read." – Jonathan Safran FoerAfter Cass Seltzer's book becomes a surprise best seller, he's dubbed 'the atheist with a soul' and becomes a celebrity. He wins over the stunning Lucinda Mandelbaum, 'the goddess of game theory,' and loses himself in a spiritually expansive infatuation. A former girlfriend appears: an anthropologist who invites him to join in her quest for immortality through biochemistry.