“For a long time he’d been periodically preoccupied by the idea that when someone you loved died, you could spend the rest of your life searching the world for that person and yet you would never, ever find him or her, no matter how many obscure places you went to, no matter how many caves you slipped into, or curtains you parted, or houses you entered. The dead person truly no longer existed, and while as a matter of science this fact seemed so simple, it was unaccountably hard to accept it when the person was someone you loved.”