"Where is Rex now?" she asked, but he shook his bead.
"I don't know. I don't even understand the mystery of his disappearance. I understand less why he should remain away, though it is extremely probable that he knew about these watchers. I've made inquiries, Joan, and I've found that your house was not the only one guarded. Men have been seen outside the flats in which I live, and probably Rex, when I spotted him from the window, saw these gentlemen also. There is a chance— the merest chance— that Kupie is still determined to prevent Rex Walton's return. If that is so, he will leave no stone unturned to achieve his object. I am afraid you'll have to endure the nuisance of a shadow for the next week or two."
He was worried about her, for at the back of his mind there lurked an uneasy sen
