The House of Spies by Warwick Deeping

When Jeremy was in a rage his imperturbable face had a smooth, tight look, the lips pressed a little more closely together, the jaw well set. His wrath was always a quiet wrath, deep, purposeful, not wasting itself in words.

De Rothan had made him more furious than he had been for years, and even the knowledge that Jasper was very little the worse for his adventure in Darvel's Wood did not modify Jeremy's anger. De Rothan was the kind of man who filled him with a scornful disgust, and to be baffled and dictated to by such a man left Jeremy quarrelling with his own self-respect. He damned De Rothan as a coward, and was equally indignant over the contradictory conviction that the adventurer had audacity and courage. De Rothan had seized a desperate chance. It had been a clever move, too confoundedly clever to please Mr. Winter.