When Margaret shut the door, Patrick was finishing with the second mattress.

When a person purposely disarranges a bed, he does not think of the second mattress.

Let us examine the second mattress.

Sarah had moved the second mattress to the door, wedging it behind the wood chest, so it was flush against the wall.

"There," he said when he had finished blowing up the second mattress.

"H'm, the second mattress," muttered M. Lecoq, as if some memory crossed his mind.