How do the characters react when tom receives a phone call from his mistress?

From the text:

The butler came back and murmured something close to Tom’s ear, whereupon Tom frowned, pushed back his chair, and without a word went inside.

Daisy started to takl more than usual, and then excused herself to follow Tom inside.

Miss Baker leaned forward unashamed, trying to hear.

Nick was shocked.

“Got some woman?” I repeated blankly.