Divorce would free him from his own wife. To free himself from Darnley he seized on the hatred which the lords whom Darnley had deserted and betrayed bore to the king. Bothwell joined Murray and the English ambassador in praying for the recall of Morton and the exiles. The pardon was granted; the nobles returned to court, and the bulk of them joined readily in a conspiracy to strike down one whom they still looked on as their bitterest foe. [Sidenote: Darnley's murder.] Morton alone stood aloof. He demanded an assurance of the Queen's sanction to the deed; and no such assurance was given him. On the contrary Mary's mood seemed suddenly to change. Her hatred to Darnley passed all at once into demonstration of the old affection. He had fallen sick with vice and misery, and she visited him on his sick-bed, and persuaded him to follow her to Edinburgh. She visited him again in a ruinous and lonely house near the palace in which he was lodged by her order, on the ground that its purer air would further his recovery, kissed him as she bade him farewell, and rode gaily back to a wedding-dance at Holyrood. If Mary's passion had drawn her to share Bothwell's guilt, these acts were but awful preludes to her husband's doom. If on the other hand her reconciliation was a real one, it only drove Bothwell to hurry on his deed of blood without waiting for the aid of the nobles who had sworn the king's death. The terrible secret is still hid in a cloud of doubt and mystery which will probably never be wholly dispelled. But Mary had hardly returned to her palace when, two hours after midnight on the ninth of February 1567, an awful explosion shook the city. The burghers rushed out from the gates to find the house of Kirk o' Field destroyed and Darnley's body dead beside the ruins. [Sidenote: Mary's fall.]