In a castle by the sea live Méléandre and his wife Selysette. They have been married four years. They have been happy, though sometimes the husband has asked himself whether they have lived near enough to each other. Now they are joined by Aglavaine, the widow of Selysette's brother, who has been unhappy in her marriage. Before she has been eight days in the castle, Méléandre cannot imagine that they were not "born in the same cradle" [sic].

Aglavaine on her part does not know whether he is her radiance or whether she is becoming his light. Everything is so joined in their beings that it is no longer possible to say where the one begins and where the other ends. (Pure love, according to the essays, is "a furtive but extremely penetrating recollection of the great primitive unity."[4]) They think of loving each other like brother and sister; but they know in their hearts that it will not be possible. (The senses are beginning to intrude into Maeterlinck's writings.) Nor can they run away from each other, or, at least, they make out they cannot: "A thing so beautiful," says Méléandre, "was not born to die; and we have duties towards ourselves." They kiss; a cry of pain is heard among the trees, and Selysette is seen fleeing, disheveled, towards the castle.

This wounded wife has less control over her natural feelings than Astolaine had in similar circumstances; but Aglavaine, in several pages of parchment speech, shows herself so wise and strong a woman that Selysette's jealousy of her is turned into love. Now all three dream of a triangular love of equal magnitudes. "We will have no other cares," says Aglavaine, "save to become as beautiful as possible, so that all the three of us may love one another the more.... We will put so much beauty into ourselves and our surroundings that there will be no room left for misfortune and sadness; and if these would enter in spite of all they must perforce become beautiful too before they dare knock at our door." They dream of a unio mystica of souls: "It seems to me," says Méléandre to Aglavaine, "as though my soul and my whole being and all they possess had changed their abode, as though I were embracing, with tears, that part of myself which is not of this world, when I am embracing you."

But Méléandre, though he loves Selysette's awakened soul more than in old days he loved her girlish body, cannot help loving Aglavaine more. "Is it not strange?" Aglavaine asks Selysette, "I love you, I love Méléandre, Méléandre loves me, he loves you too, you love us both, and yet we cannot be happy, because the hour has not yet come when human beings can be united so."

It is clear that one of the two women must go. In spite of her duty to herself Aglavaine, in a fit of generosity, decides to sacrifice herself; but Selysette makes her promise not to go till she herself tells her she may. She talks mysteriously to Aglavaine of a plan she has conceived for putting things right; and it is the great weakness of the drama that the wise woman, who can read souls so easily, cannot guess the truth in this one instance. A fool would have known that Selysette was contemplating suicide; but Aglavaine could not be allowed to wreck the tragedy....

There is an old abandoned lighthouse tower that the seagulls scream round. It is crumbling away at the top. Méléandre had only climbed it once, and then he was dizzy.... Here comes Selysette with her little sister, Yssaline, for whom she has promised to catch a strange bird with green wings that has been seen flying round the tower.... She thinks it has built its nest in a hole in the wall just where she can lean over.... She leans over to seize it, and the top of the wall gives way. She is precipitated on to the sands below. She would be killed if it were not for the fifth act; but she lives long enough to make out that it was a pure accident, so that the two surviving lovers may be happy ever after with a clear conscience.

In spite of great beauties, the play as a whole is disappointing. The fourth act, indeed, is perfect. In the first four acts we have the doctrine of silence, as well as various other doctrines, dinned into our ears. Méléandre is a milksop; Aglavaine is a bore; but Selysette is a beautiful creation—the only one of Maeterlinck's women, perhaps, who is absolutely natural. She is "unconscious goodness," says a critic, whereas Aglavaine is "conscious goodness"; and no doubt she does represent an idea;[5] but she is nevertheless a real, created woman. Méligrane, the spiteful old grandmother, is in the main the same idea (wisdom is in babes and the very old) as the greybeards of other plays; but there is not very much of her, and she must be remembered for saying this (to her granddaughter, Selysette):

"And so it is thanks to you that I was a mother for the second time, when I had ceased to be beautiful; and you will know some day that women are never tired of being mothers, and that they would rock death itself, if death came to sleep on their knees."

Aglavaine and Selysette is at all events important as being a turning-point in Maeterlinck's development. We have seen that he had applauded Emerson's sturdy individualism. There is as much individualism as fatalism in this play. It is true that love is fatal to Selysette, but that is because Aglavaine is a monstrosity, not because love is a dark power—in this play it is distinctly painted as a bright power. Death is only called in as a saviour from an intolerable situation: Selysette dies, but she dies with a clear mind, and with a smile.

Aglavaine and Selysette is legendary in its setting only; and it is not vague, but a clear handling of a problem which is a favourite with contemporary dramatists—another notable example is Gerhart Hauptmann's Einsame Menschen ("Lonely Lives"). Hauptmann, like Maeterlinck, simplifies the complexity by the suicide of the most sensitive member of the group: both dramatists come to the conclusion that the time is not yet ripe for reorganising cohabitation on a plural basis, and that (to quote Dryden) one to one must still be cursedly confined. What Maeterlinck has contributed to the problem is that he makes the two women love each other as well as the man they sandwich....