But I tell you I didn't.

I swear I didn't!" he cried loudly, with a vehemence which did not convince her.
"Of course you didn't," she said in a soothing voice.

"But what are you going to do if they try to make out that you did?
What are you going to tell them ?" He gazed at her with miserable eyes and said in a miserable voice: "God knows what I'm to tell them.

It isn't a matter of telling them.

It's how to make 'em believe it.