At Paddington railway station, Martin comes across a girl whose purse, including all her money and her train ticket, has been stolen by a pickpocket. In this predicament, it could easily have been one of his sisters, and so he can't just walk on by, can he?

Later, having bought her a new ticket and lunch on the train, the railway line becomes blocked by snow. They can't get to their destinations today as expected and as he now feels committed to her rescue, what is he going to do?