“She has always imagined that if she had five minutes left on earth, she’d call the person she loved most and tell them all the things she needed them to know. But most goodbyes are small. They take place in the middle of stations and shopping centres, where there’s too much going on to really focus on the goodbye at all, distracted by the counter-terrorism alerts blaring from the station loudspeakers, and the queue for Greggs that snakes through the concourse.”