'It is all a ridiculous mistake; but these things happen sometimes, and we can easily set it right.

It won't be hard to prove our innocence.

I can show that I was out of the country on the 23rd of May, and Bob was in a nursing home.
You were in London, but you can explain what you were doing.' 'Right, Percy! Of course that's easy enough.

The 23rd! That was the day after Agatha's wedding.

Let me see.