Monk stared and winced. "How do you know that?"
"Mr. Wentworth Marr was at Murchester on the day when the crime was committed. He came down in his motor and stopped at the Lion Hotel. He left a card for Lord Cannington at Murchester Barracks. He also went to Mootley to see Anne Caldershaw."
"You can't prove that," said Monk, and wiped the perspiration from his brow nervously. "I admit that I did motor down to Murchester to ask Cannington to influence his sister in my favor. I called in the afternoon and left a card. Then I stopped the night at the Lion Hotel, and returned to town the next morning."
"And after you found that Cannington was absent--about three o'clock, that was--you went to Mootley to see Anne Caldershaw."
"Prove it, prove it."
"I daresay Mr. Striver can prove it. He was concealed upstairs."
"I was asleep for a time," said Striver abruptly, "but I woke in time to see Mr. Monk. I peered down the stairs and saw him talking to my aunt in the shop. The sound of their voices raised high woke me up. They were quarrelling."
"I don't deny that I was there," said Monk, wiping his face again, "but I want to know how Vance learned my whereabouts. It's a guess based on my leaving the card on Cannington."
"It is not," I said sharply; "your daughter was in the back room and saw you through the open door. She refused to tell me this, but as she said that the sight of a certain person drove her hastily out of the back door, so hastily that she left her cloak behind her, I believe that person was you, Mr. Monk."
"I was simply calling on Mrs. Caldershaw. There was no reason why Gertrude should not say so, although I did not know that she was there."