Dawfield had been sent off to intercept the flight or start the pursuit.

Austin found himself profoundly hoping that his son was by that time out of England.
He had not much leisure to think of that, for Barrant turned towards him again with an annoyance that he did not attempt to dissemble.

"Why has your son gone to London--perhaps you can tell me that much ?" he exclaimed.
"I gathered from him that it is his intention to look for his cousin Sisily." "For what purpose ?" "Because he strongly believes in her innocence." "It is strange that he should have rushed off like this." "Without waiting for your visit, do you mean?
Really, Detective Barrant, may I constrain you to give me some explanation of all this?
I want to help you all I can, but your actions savour too much of a peremptory jack-in-the-box, even in these bureaucratic days.

What is the object of this visit?
Why did you want to see my son ?" "I wished to interview him." "About what, may I ask ?" Barrant did not immediately reply, but Austin, scanning him furtively, sought to reach his thoughts by the varying shades of expression on his face.

It was the state of mind of a man who was at once chagrined, amazed, suspicious, and wondering.