"I saw you on Tuesday night," he laughed. "You arrived at the house about half-past eight, and had a great trouble getting in."
"Were you there?" she cried eagerly. "I never dreamed that you were in the vicinity. Yes, you are right. I rang and banged on the door half a dozen times before I could attract auntie's attention. She generally leaves the door unlocked in case anyone should call."
"Boyne returned about twenty minutes after you had left, but though I watched till midnight, he did not come out again."
"Couldn't you take a day off one day and follow him when he goes out in the morning?" the girl suggested. "I would do it, but I fear that he'd recognise me."
"I might. But I think I may be more successful at night. It is very difficult to keep observation upon a person in broad daylight. In the darkness it is much easier."
"Why not try again to-night?" suggested Marigold. "I'll go with you."
He shook his head.
"Sunday night is a bad night. We know his habits on week-days, but he may have gone out all day to-day," he replied. "No; to-morrow would be more likely."
"Then let's both go there to-morrow night, and if he comes out of the house we'll watch where he goes."
With this suggestion Gerald agreed, and after she had smoked the cigarette he handed to her from his case, they resumed their punting up-stream in the afternoon sunshine.