Does 'In about a quarter of an hour the bell rang, and Tuppence repaired to the hall to show the visitor out.' stand in direct opposition to the premise 'The visitor was only allowed to stay in the house for 15 minutes, no more or no less. '
In about a quarter of an hour the bell rang, and Tuppence repaired to the hall to show the visitor out.###The visitor was only allowed to stay in the house for 15 minutes, no more or no less. 