"I went up to my room to get some tobacco."
"Is that all, Mr. Guest?"
"Substantially," nodded Guest. "I opened a new tin, and cut myself on the jagged edge. It took a few minutes to stop it bleeding." He pulled up his shirt-cuff in a leisurely way, and showed Harding a long scratch on his wrist. "Nothing much, but I'm an easy bleeder."
"Did you see anyone while you were upstairs?"
"No."
"And when you had stopped the bleeding, did you go straight back to the terrace?"
"Straight back."
"Mr. Halliday, I think, called attention to the fact that there was blood on your cuff?"
"He did."
"Did you show him that cut?"