Cunning applied to Grizel! David shuddered.

He thought of Tommy, and shut his mouth tight.

He could do this easily.

Tommy could not do it without feeling breathless.

They were types of two kinds of men.
David also remembered a promise he had given McQueen, and wondered, as he had wondered a good deal of late, whether the time had come to keep it.
But Grizel sat on with her unopened letter.