He struggled again, but still his thoughts were on the letter. He did not wish to open it, having some vague idea that, till the letter should have been read, there was a chance of escape. The letter would not become due to be read till the next day. It should not have been there now to tempt his thoughts on this night. But he could do nothing while it lay there. 
He struggled again, but he could do nothing while the letter lay there.
