“That was the day I met them both on Mrs. Mervyn-Robertson’s house-boat. They were then both in the best of spirits, apparently, and looked radiantly happy.”
Again he pondered, his brow slightly contracted.
“Where did Miss Hagerston sleep that night?” he asked suddenly.
This was a question Cora had not expected. She colored violently. Then she said awkwardly:
“Oh, at her flat in Knightsbridge, I suppose.”
“You don’t know for certain?”
“No. How should I?”
“You say that you and Miss Hagerston are great friends, Mrs. Hartsilver, so I thought that probably you would know. She did not, I suppose, spend the night on Preston’s house-boat?”
“How could she, Doctor Johnson, alone with him!”
The doctor looked at her keenly, but she would not meet his gaze.