The Herapath Property by J.S. Fletcher

Triffitt considered Carver's report during a moment of mutual silence. If he had consulted his own personal inclination he would have demanded to be led straight to the taxi-cab driver. But Triffitt knew himself to be the expender of the Markledew money, and the knowledge made him unduly cautious.

"It comes to this," he said at last, "this chap knows something which he's already told to this Mr. Tertius. Mr. Tertius has in all probability already told it to the people at New Scotland Yard. They, of course, will use the information at their own time and in their own way. But what we want is something new -- something startling -- something good!"