The Truants by A.E.W. Mason

Lionel Callon's visit to Millie Stretton bore, however, consequences which had not at all entered into his calculations. He was unaware of the watchers at Lady Millingham's window; he had no knowledge of Pamela's promise to Tony Stretton; no suspicion, therefore, that she was now passionately resolved to keep it in the spirit and the letter. He was even without a thought that his advances towards Millie had at all been remarked upon or their motive discovered. Ignorance lulled him into security. But within a short while a counter-plot was set in train.

The occasion was the first summer meeting on Newmarket Heath. Pamela Mardale seldom missed a race meeting at Newmarket dining the spring and summer. There were the horses, in the first place; she met her friends besides; the heath itself, with its broad expanse and its downs, had for her eyes a beauty of its own; and in addition the private enclosure was separated by the width of the course from the crowd and clamour of the ring. She attended this particular meeting, and after the second race was over she happened to be standing amidst a group of friends within the grove of trees at the back of the paddock.