Minutes after her fiance’ stormed away, pouting over not getting his way during their time alone, she decided to test how a certain other man would act in a similar situation. Gwen Kaplan stood in the doorway of the familiar hospital room, studying the man who had so disrupted her once well-ordered life. Mark Cahill lay stretched out in bed with his eyes closed, using earphones to listen to a recording of, “A Farewell to...