It...

it was I." "You ?" The fierceness seemed all to drop away from him, whelmed in the immensity of his astonishment.

"You ?" Then he laughed loud in scornful disbelief.

"You think to save him," he said.
"Should I lie ?" she asked him, calm and brave.
He stared at her stupidly; he passed a hand across his brow, and looked at Diana.

"Oh, it is impossible!" he said at last.
"You shall hear," she answered, and told him how at the last moment she had learnt not only that her husband was in Bridgwater, but that he was to sup at Newlington's with the Duke's party.
"I had no thought of betraying you or of saving the Duke," she said.
"I knew how justifiable was what you intended.