Sadie laughed. It had been a long time since Sam had heard Sadie laugh genuinely. Many things had changed about her, but he was pleased to discover that her basic laugh was untouched, aside from an inevitable, slight change of key. She had, he thought, one of the world’s great laughs. The kind of laugh where a person didn’t feel that he was being laughed at. The kind of laugh that was an invitation: I cordially invite you to join in this matter that I find amusing.