She left the castle easily, finding the postern gate left open and no guard there to question her. She reached the cliff above the sea just as the moon was reaching its zenith. Conlan was already there under the mighty oak, his tall form in shadow.

He was not alone. The Queen stood nearby, draped in a long dark cloak, her face pale. In her hand was a switch, which she tapped against her leg as Muirin slowed her steps, then joined them.

«Muirin,» her stepmother said, her voice smooth and emotionless, «what mean you by stealing from the castle in the dark of the night?»

«It is not dark, madam. The moon has lit my way.»

«Have you come to swim?»

«No, madam. I have come but to enjoy the moonlight on the sea.»

«Liar! You have come to steal away with the woodcutter’s son!»

«No, madam, we do not plan to leave!»

«You would stay here then, with him? Your father is even now finding you a husband, you ungrateful girl!»

«I want no husband but Conlan.»

«You mean to defy me? You?» She raised her switch as though to strike Muirin.

«No!» Conlan shouted, rushing forwards from the dark, his arm outstretched.

Before he could reach her, the stepmother whirled to face him. «You would strike me, son of the earth?»

«Do not harm her!» he roared.

«She must be punished!»

«You will not harm her!» Conlan raised his arm.

«Then let it be you who suffers.» Muirin’s stepmother raised the switch and pointed it at him, her voice rising into the air. «I call upon thee, forces of darkness, to give me strength. Strike him down, he who would harm your priestess, he who would defy me!»

There was a strike of lightning from a sky that had been clear a moment before, a great swirl of wind that brought the sudden smell of sulphur.

«Strike him down, oh forces of darkness!» the stepmother called again, raising her arms high, her cloak spreading behind her like wings. «Make him pay for daring to defy me! Root him to the ground!»

Lightning split the sky again, and a roar of wind blew leaves and branches and dirt into the air. Muirin put her hands over her eyes. There was a clap of thunder so loud that it deafened her. And then silence.

She looked up, but saw only darkness. The moonlight was gone, the sky a black dome above her. Nothing seemed to move, nothing to even breathe. And then, dimly, the sound of the sea came to her, a soft murmur.

«Conlan?» she whispered, reaching for him.

Her hands found only air and she stepped forwards in the dark, then again, reaching for him. «Conlan?» Again there was only silence, and she grew fearful. «Are you hurt? Conlan, speak to me!»

Her hands found the trunk of the giant oak, and she stretched her arms around its width, laying her head on its bark.

«Conlan?» There was only silence.

Muirin spent the remainder of the night under the tree, waking at dawn, surprised that she had slept at all. Night was receding and while the light was still dim, it was enough for her to see that it was not the ancient oak under which she had slept, but a much younger tree, a slender oak tree with leaves the colour of Conlan’s eyes. And there, a handful of paces away, the ancient oak.

She stared at both trees. Two. For all the years of her life, there had only been one tree here on this cliff. She jumped to her feet, staring at the two trees.

«Muirin.» The voice was soft, feminine.

Muirin whirled around to find the owner of the voice. The cliff was empty but for her and the two trees. Far below her, in the cobalt water of the western sea, three dolphins swam in spirals, and above her, perched in the highest branches of the ancient oak, three ravens watched.

«No,» said the voice. «It is not they who speak to you, child.»

«Who are you?» Muirin asked in a small voice.

«I am here, child, in the wind, in the air. You cannot see me, but I am with you.»

«Mother?»

There was the sound of soft laughter. «No, although I knew her as well. A fine woman who did not deserve to die so young. Nor did you deserve to lose her, or your father to fall under the spell of the enchantress you call your stepmother.»

Muirin turned to look all around her. «It is true. But I cannot see you.»

«Do you wish to?»

«Oh, yes, please!»

More soft laughter followed, then a small glowing ball appeared in the air before Muirin, slowly enlarging until it was the size of a dainty person. Within the glow was the most beautiful woman Muirin had ever seen. Her hair was golden, her skin soft and supple, her gown of gossamer. She smiled, her eyes lighting with humour. «Is this better, child?»

Muirin stared in awe at the lovely woman. «You are one of the fair folk, come from the Otherworld!»

The creature smiled again. «It is true. I am of the aes sídhe, come from Tír na nóg.»

«I have nothing to offer you!»

«I have not come to ask for an offering, Muirin, but to aid you in your plight. We are the People of Peace, and this night your stepmother has disrupted our peace. It is she who has done this, who has cast a spell over Conlan and transformed him. She has rooted him in the ground.»

Muirin whirled to look at the slender oak tree. «It is true, then? I had hoped it was but a terrible dream.»

«It is true. Conlan is no more.»

Muirin clasped her hand over her mouth with a moan, then threw her arms around the tree. «Conlan! Oh my love! I should never have defied her! Conlan!» She whirled back to the woman of the fair folk. «Is it forever? Can it be undone?»

«There is one way by which he can be returned to human form, Muirin. But it is very dangerous.»

«I don’t care about danger! I will do anything that would bring Conlan back to me!»

«It will require great courage, child.»

«I will find courage enough to do whatever is required.»

«And great physical strength.»

«I will find the strength I need!»

«And you must outwit a terrible foe.»

«I will find a way to do that! Please tell me what I must do!»

«You must go to the land of the merrow and the mermen. To Tir fo Thoinn, the Land Beneath the Waves.»

Muirin thought of all she had heard of the Land Beneath the Waves, the home of the beautiful merrows — the mermaids who sometimes took human form and lived among men. And of the mermen, said to be hideously ugly creatures covered with scales, having the features of pigs and long, pointed teeth.

«The merrow are sometimes hostile, Muirin. You could be in danger.»

«How can I go there? How will I breathe?»

The woman looked up at the ravens. «They will aid you.»

«What must I do there?» Muirin asked.

«In the Land Beneath the Waves there are mermen who hold the souls of drowned sailors in cages, called soul cages. You must free three of them.»

Muirin nodded. «I will do it. Anything to free Conlan from the enchantment.»

«There is more you must do.»

«Please tell me!»

«In the Land Beneath the Waves there is a castle in which a lovely princess lives. An enchantment has removed all colour from her life, and only a clever human can restore it.»

«I will do it! But how?»

«You will have to discover that.»

«I will! Anything to free Conlan.»

«There is still more, Muirin.»

Muirin began to grow afraid. «Tell me, please.»

«There is an ogre who has terrorized three merrow sisters. You must kill him.»

«But how?»

«You will have to discover that. Are you willing?»

Muirin swallowed, but nodded. «Anything to save the man I love.»

«If you are successful, you will return home to find Conlan restored, your stepmother banished beneath the waves and your father freed from her spell.»

«Yes! But how.?» Muirin clasped her hands before her as the sídhe’s glow began to fade. «Oh, do not leave me yet! I don’t know enough! Where should I go?»

The woman, already transparent, looked down at the dolphins again. She continued to fade. «The dolphins will aid you. Safe journey, child. Courage!»

And then Muirin was alone again. She stared around her, seeing the lonely cliff, empty but for her and the two oak trees. She looked at the slender oak and lifted her chin.

«I will free you, Conlan!» she cried.

For a long moment, Muirin could not move. She stood where she was, her hands clasped before her, looking out over the sea. She was afraid. Then she walked to the slender oak and threw her arms around its trunk.

«I cannot live without you, my love. I will not live without you.» She placed her lips against its bark. «Conlan, if I do not return, I will find you in the afterlife. I will always love you. Always. Stay strong, my love.»

And then she left, walking slowly down the path that led from the cliff to the sea. In the water below her, the three dolphins still swam in spirals. She looked up at a harsh cry above her, to see the three ravens spinning overhead. They swooped past her, circling something at the far end of the beach. One lifted it, and with the others flanking it, flew towards her as she reached the shingle, then lay it before her on the rocks.

It was a small red cap made of feathers. A cohuleen druith, she realized, recognizing it as the magical cap that enabled the merrows to swim through the ocean. Muirin had heard that if a mermaid lost this cap, she also lost her ability to return beneath the waves. Muirin looked around her now, half-expecting to see the merrow here, but there was no beautiful woman walking on the beach.