A flicker of unusual agitation on Colwyn's calm face increased Caldew's mental confusion.
"I don't understand," he stammered. "He—Nepcote—why should he be watching us?"
"Because he penetrated the truth last night. He knew he was in danger."
"But why should he follow us here?"
"He accidentally dropped some cards from his pocket-book when giving Merrington an address at his flat last night, and one of them was Wendover's business card. Merrington did not see it—it would have conveyed nothing to him if he had—but I did. Nepcote knew that I saw it, and must have realized that I suspected him. He has been watching my rooms and followed us here, or he has been hanging around this place to see if I called on Wendover."
"Even now I do not see the connection. If Wendover told us the truth, Nepcote has not been to him with the necklace. Then what did it matter to Nepcote whether you came here or not?"
"Nepcote may have been the man who offered the diamond to Wendover."
"That is impossible. Wendover says that man called some days before the murder."
"Still, it may have been Nepcote."
"That goes beyond me," said Caldew, with a puzzled look. "What are you implying?"