"How do you know he came to kill you?"

"He said so."

"He said so?"

"Yes. I told him I had a pretty good idea of the plot. The Irishman had given it away, I said."

"The Irishman? What Irishman?"

Darwen smiled. "That's precisely what I wanted to know. There are on the electricity committee, three Irishmen, two Welshmen, four Englishmen, and one Scotsman."

Carstairs remained silent.

"Would you like to make a guess?" Darwen asked.

"Mr Pat Donovan."

"Right in once." Darwen's eyes sparkled. "You know a devilish lot about machinery, but I admit I thought you were rather a fool as far as men were concerned."