Worse follows. The boy falls in love with Regina, his half-sister, as to whose identity he is in absolute darkness, for she has been brought up as a maid in his mother's house. But with his mind weakening he clutches at this straw to help him. "Isn't she splendid, mother?" he says, admiring the girl's superb animal development, and we can easily conjecture the agony of his mother. Weak she must appear in the pastor's eyes, for she almost hesitates about revealing the birth of Regina, and wavers on the question of Oswald marrying her. She has been too indulgent to the boy, and Manders does not scruple to tell her so. He is one of your iron-minded men who have a rigid sense of what is right and wrong, and one who would have no sympathy with fluttering souls like Amiel, Lamenais, Clough, or any of the spiritual band to whom dogmas are as steel clamps. Mr. Manders is outraged at Mrs. Alving, and proposes sending Regina away, but where? To her father, Jacob Engstrand, a cunning, low, hypocritical rascal? No, he is not her real father. At the end of the first act both overhear Oswald trying to kiss Regina in the dining room, and another such scene, in which Captain Alving and Regina's mother were the actors, flashes before her, and she cries "Ghosts!" as the curtain falls. Everything then goes wrong. The Alving orphanage burns down, and there is no insurance because Pastor Mander believes that insuring a consecrated building against fire would be questioning Providence. But his human respect plays him into the hands of Jacob Engstrand, whose cunning is more than a match for the worthy priest. The dialogue between these two widely varying types is a masterpiece. Mrs. Alving is at last goaded into telling Oswald and Regina of their blood relationship, and the girl, who is a bad, selfish lot, goes away--deserts the family at the most critical period. She upbraids Mrs. Alving for not having told her of her true station in life, and turns her back on the poor mumbling wretch Oswald. She then walks off defiantly and to her putative father's home, a sailors' dance house. Oswald's mind is completely unhinged by this dénouement, and he confides to his mother in stuttering, stammering accents--the sure forerunner of the crumbling brain within--that he has some poison to kill himself with; that he had relied on Regina to do it when he would be an absolute idiot; but, as Regina was at hand no longer, his mother must play the executioner.