High in the branches of a great fig tree by the riverbank, a monkey named Qais made his home. He was happy there, leaping from limb to limb and picking the sweetest fruit. He didn't have many friends. Most of the animals in the forest saw him as reckless, restless, and impatient. But deep down, he loved his tree, and he loved the sound of his own voice when he sang to it in the morning light.

One afternoon, while tossing fig skins into the water, Qais noticed something strange surfacing. It was a creature called a Ghaylam, a tortoise named Halima. She was old, her shell covered in cracks and green algae, and her eyes held the wisdom of the entire river. Every day she came out to sun herself on the same rock and listen to him.

One day she spoke to him. Her voice was quiet, like the stream moving over stones. "You have a beautiful voice, Monkey. If I had a voice like yours, I would fill this river with songs."

Qais felt a joy he had never known before. No one had ever praised him like that. "Come here," he said. "Eat from my figs." She stretched her long neck and took the fruit from his hand.

That was how the strangest friendship on the riverbank began. Qais would tell Halima about the secrets of the forest, the way the wind toyed with the leaves, and the starling that stole his figs. In return, she told him of the river's secrets, the silent world beneath the surface, and the fish that dreamed they could fly.

Then came the day Halima's voice sounded rough, like gravel rolling underwater. "My friend, I am old," she rasped. "I have no one left in this river. My husband died years ago, and I never had children. And you, you are alone too. Why don't we live together? My husband used to say there is a small island in the middle of the river, filled with fruit trees. The fruit there is sweeter than your figs. Come. Ride on my back, and let us go there."

Qais was excited. He trusted the friend who shared his meals and listened to his songs. He jumped onto Halima's back, and they set out across the wide water. Qais laughed, splashing the water with his hands, dreaming of that happy island. But Halima, as she swam, sank deep into her old memories. She remembered her husband. She remembered how he loved to eat monkey brains. There was an old story that monkey brains could cure any sickness and make you live longer. She looked at Qais sitting on her back, at his small head, and felt a sharp pang of hunger.

"Qais," she said, and her voice was not like water anymore. "Before he died, my husband made me promise to eat the brain of a monkey. I am old, and I am afraid of dying. You are my only friend."

The blood froze in Qais's veins. He felt the betrayal wrap around him, cold as the river current. But he was a clever monkey. He kept his voice light and innocent. "Halima, my dearest friend," he said, "why didn't you tell me before we left? We monkeys keep our brains in the high branches of trees. I left mine hanging on the fig tree back there. We should have brought it with us. It is alright. Take me back, and I will give it to you."

The idea pleased Halima, simple as she was in her old age, and she believed the monkey's lie. She turned around and swam him back to the bank. The moment Qais's feet touched the earth, he leaped high into the fig tree and settled on the highest branch. Halima looked up at him from the water. "Hurry, Qais," she called. "Get the brain so we can go."

Qais let out a laugh, bitter and harsh, that echoed across the river and through the trees. "You foolish old tortoise," he said. "Have you ever seen an animal leave its brain outside its head? I tricked you just as you tried to trick me. Go on now. Go find another monkey's brain. As for me, I have learned never to trust anyone who would change the river's current just for my sake."

Tears rolled down Halima's face and mixed with the river water. She wasn't crying for the lost meal, but for the only friend she had left. She sank into the dark depths of the river and vanished. Qais sat alone on his branch. The tree was the same, the figs were just as sweet, but when he sang the next morning, his voice had lost something of its joy.