“Why should I have been in Roger's flat? Can you think of any reason?”

“Yes,” said Giles. “I can.”

Kenneth's lip curled. “I see. Murder. You're wrong.”

“Not murder. Jealousy.”

A flush crept into Kenneth's lean cheeks. “Again you're wrong.”

“Very well, what was the reason?”

“You've already heard me say that I didn't leave the Albert Hall until past four.”

“Is that statement likely to be corroborated by the other members of your party? Miss Rivers gave that alibi, not you. I was watching you; you weren't expecting it. I think you nearly denied it.”

“Why don't you join the police-force?” inquired Kenneth. “You've missed your vocation.”

Giles got up. “You young fool, can't you see what a tight corner you're in?” he said. “Lie to Hannasyde if you must, but if you lie to me you can look for another lawyer. I won't touch your case.”