The woman wrung her hands piteously; Jack could see the tears rolling down her face.

"Oh, if I only could--if I only dared," she whispered; "and yet I cannot, even if it were only for your sakes. If you only knew what was hanging over you--but I must say no more. When that man comes to me, when I stand before him with his eyes looking into mine, I am compelled to give him up the secrets of my very soul. I wish from the bottom of my heart that----"

Serena clutched at her throat with a quivering hand, as if something choked her, and rushed impulsively from the room. She had said nothing, and yet she had said so much. Her very reticence, her hesitation to speak definitely against her master, had proved conclusively to Jack what a consummate scoundrel Anstruther was. He was still debating the matter in his mind when Rigby came back to him. The latter did not speak; instead of that, he took Jack by the arm and piloted him quietly and firmly to the front door. They were in the street before Jack could ask the meaning of this cautious conduct.

"One can't be too cautious in a case like this," Rigby explained. "It was just as I had expected. Anstruther was at home; he, indeed, had not been out all day, which fact was proved by his still being in dressing-gown and slippers. Our usually self-contained friend had either been dissipating last night or he has had disturbing news; at any rate, he was very pale and shaky, and did not seem in the least pleased to see me. Not that I think that he was in the least suspicious of my visit."

"Did you happen to see anything of Padini?" Jack asked eagerly. "Well, I did and I did not," Rigby explained. "At any rate, the Italian was not in the study, though he had been there, from the simple fact that a music case and a rather jaunty-looking Homburg hat rested on a side table. Did you happen to notice if Padini was wearing a Homburg hat this afternoon?"

Jack was able to reassure his friend on that point, whereupon Rigby proceeded to ask if anything had happened during the time he was left alone with Serena. Rigby listened with interest to all that Jack had to say.

"That's a woman we ought to get hold of," he said thoughtfully. "Unless I am greatly mistaken, she can tell us all we want to know. As a matter of fact, she has told us a great deal, though perhaps without knowing it. At any rate, from what you say, she is quite aware of the fact that something uncanny is going on at 4, Montrose Place. I feel perfectly certain that the body of Nostalgo was smuggled away via
that empty house; we know perfectly well that Anstruther is in the habit of going there, and we are equally sure that the very mention of the house filled Serena with terror. As we have plenty of time on our side, and there seems to be no immediate hurry, you and I are going to keep our eye on that place. You were very anxious last night to know what I had seen there. Well, you have plenty of pluck and courage of your own; you shall come with me presently and verify the thing for yourself."

"Do you mean to say we are going to keep a vigil there to-night?" Jack asked.

"That's about the size of it," Rigby answered coolly. "You had better come round to my rooms not a moment later than half-past ten. Mind you, we are not going there as ourselves, but you can leave a disguise quite safely to me. Don't bring a revolver or anything noisy of that kind; something in the way of a thick stick would be much safer. By the way, didn't you tell me that you were going to see Miss Helmsley to-night? Take my advice, call there and dine as if nothing had happened, and directly Anstruther makes an excuse to return to his study, slip away from the house without the formality of leave-taking and come to my place at once."

It was not easy work for a straightforward fellow like Jack to sit with Anstruther on the other side of the table, discussing trivial topics as if there was nothing grim and terrible behind this picture of refined home life. Jack was conscious of carrying himself off fairly well, what time Anstruther rose from the table with an excuse that he had work to do.