The Book of Evidence, John Banville

Freddie Montgomery is a highly cultured man, a husband and father living the life of a dissolute exile on a Mediterranean island. When a debt becomes due and his wife and child are held as collateral, he returns to Ireland to secure funds. That pursuit leads him to commit murder. And here is his attempt to present evidence, not of his innocence, but of his life, of the events that lead to the murder he committed because he could. Like a hero out of Nabokov or Camus, Montgomery is a chillingly articulate, self-aware and amoral being, whose humanity is painfully on display.