I know where she is," he said.

"Keep the breakfast hot!" And with that he was gone.
He drove out of the yard a few minutes later in his dog-cart, muffled in a great coat with the collar up to his ears.
At the station, Doris sat huddled in a corner of the little waiting-room counting the dreary minutes as she waited for her train.

No one beside herself was going by it.
She had walked across the fields, and had made a _detour_ to leave a note at the Manor for Hugh.

She could not leave Hugh in ignorance of her action.
She glanced nervously at the watch on her wrist.

Yes, Jeff probably knew by this time.