Mrs. Cregan, unaware that the pair were married, and equally unsuspicious that Danny had any darker scheme in his mind, went at once in search of the required symbol, feeling that if only Eily could be got away from the district, Hardress would think no more about her, and thus his marriage with Anne Chute could be hurried forward; and soon she returned with one of Hardress's gloves, which was joyfully seized by the boatman, who eagerly set about carrying out his base design, by which he intended to force the Colleen Bawn, by threats of murder, to give up her marriage certificate, knowing that if once this could be destroyed, she had no legal claim on Hardress Cregan, since the priest who had wedded them, and all other witnesses of the marriage, were dead.

With stealthy haste, Danny Mann got out his boat; and, making his way to the cottage of the Colleen Bawn, he informed her that Hardress had sent him to fetch her away at once. The unsuspicious Eily was filled with joy on hearing this, for she had seen and heard nothing of Hardress since the night he had left her in anger; and she eagerly stepped into Danny Mann's boat, believing that her beloved one had forgiven her, and was about to acknowledge her as his wife. The fact that Danny appeared to have been drinking somewhat heavily did not cause her any alarm for her safety; for it never entered into her trusting heart that the old boatman, who had always loved her, could ever do her harm, much less that he had deliberately bolstered his courage with drink for this very purpose.

Too soon, however, her fears were awakened; for Danny Mann, instead of taking her to the opposite shore as she had expected, hastily rowed her to a dark and lonely water cave, where he roughly bade her step out on a rock. Then he commanded her to either deliver up to him the marriage certificate which he knew she now always carried in her bosom, or be thrown by him into the lake to drown; and poor Eily, at last full of fear, implored him to have pity upon her, since she had sworn to the priest, Father Tom, that she would never part with her marriage lines.

But Danny Mann was too devoted to Hardress Cregan to be kept from his resolve by even the tearful entreaties of the fair Lily of Killarney; and still believing that he was acting in the real interests of his beloved young master, he fiercely demanded the marriage certificate, and upon Eily again firmly refusing to part with it, he pushed her remorselessly into the water.

At this moment a shot was fired, and Danny Mann, mortally wounded by his unseen assailant, fell also into the water.

The person who had fired this shot was none other than Myles-na-Coppaleen, the Colleen Bawn's peasant lover, who used this solitary water cave as a hiding-place for the kegs of whisky and other contraband goods which he smuggled from time to time; and swinging himself by means of a long rope into his secret domain at the moment of Eily's fall into the water, and seeing a moving form on the rock, he mistook it in the darkness for an otter, took aim, and fired.

He was just chuckling over the excellent shot he had made, when he noticed something white floating in the water; and soon, to his horror, recognising this as the form of his beloved Eily, he instantly dived in to her rescue. After some little difficulty he reappeared with the now unconscious girl in his arms; and placing her tenderly in his boat, he hastily rowed her away from the cave, and conveyed her to his own cabin.

Here, with great tenderness, he restored her to consciousness once more; but on learning from her that it was Danny Mann who had thrust her into the water, and whom he had himself shot in the cave in mistake for an otter, he suspected foul play, and determined to keep the girl hidden for the present, believing the old boatman to be dead.

But Danny Mann, although mortally wounded, did not die immediately; and after a long and painful effort, he managed to crawl from the cave and reach a place of safety, where aid was forthcoming. He begged his rescuers to send for Father Tom, that he might confess to him before he died; and on the arrival of the priest he told him of the whole plot, and that he had drowned Eily O'Connor in the hope of being of service to Hardress Cregan.

The unaccountable disappearance of the Colleen Bawn confirmed his story, which quickly spread; and this information coming to the ears of Corrigan, the agent, he at once went before the magistrates, and accused Hardress Cregan of complicity in the crime. An order was accordingly made out for the arrest of Hardress; and Corrigan set off with the officers of justice and soldiers for this purpose, maliciously triumphing in the revenge he could now take upon the Cregans for their contempt of him.