The Lure of the North by Harold Bindloss

There was silence for a minute or two after Agatha had spoken, and then Father Lucien said, "Now we know what Driscoll looked for. Few secrets can be kept."

Thirlwell gave him a warning glance that Agatha did not note. She was gazing across the river, her face towards the North, as if she had forgotten the others, but she presently roused herself.