Then, abruptly, everything changes: a man has a heart attack, and can't be resuscitated; the train is stopped, an ambulance called. The passengers leave the train.
Lou witnesses the man's final moments. Anna and Lou share a cab when they realise the train is going nowhere fast. Anna is Karen's best friend.
And Karen? Karen's husband is the man who dies.
Telling the story of the week following that fateful train journey, One Moment, One Morning is a stunning novel about love and loss, about family and – above all – friendship. A stark reminder that, sometimes, one moment is all it takes, it also reminds us that somehow, and despite everything, life can and does go on.