How to be good

According to her own complex moral calculations, Katie Carr has earned her affair. She's a doctor, after all, and doctors are decent people and on top of that, her husband David is the self-styled Angriest Man in Holloway. When David suddenly becomes good however, properly, maddeningly, give-away-all-his-money-good, Katie's sums no longer add up and she is forced to ask herself some very hard questions