That evening, outside the window, the clouds were big and soft like gray pillows. Soon it began to rain, but it was not a rain like all the others. It was the singing rain. Every drop made a different sound: on the leaves it said "pling," on the roofs it went "tum," and in the puddle in the yard it sang "choof.".

In Lily's little room there were also Ziggy, Skye, and Dash. With the blankets they had built a tent over the bed, and inside a little flashlight glowed. On the walls, the hanging drawings seemed to dance along with the shadows. The four friends had invented a game: close your eyes and guess where each sound of the rain came from.

"This one comes from the roof!" laughed Dash. "And this one from the window!" said Ziggy.

"Listen," said Lily, who had blue eyes and a strong spirit. "The rain is singing a song just for us."

Skye, calm, rested her head on the pillow and smiled. Dash clapped his hands to the beat, and Ziggy tried to make those sounds with his mouth.

Then the house grew quiet, and a curious thing happened. One of Lily's slippers began to move on its own. It was Ciabù, the adventurous slipper. At night, when everyone was sleeping, she loved to explore the rooms, and almost always ended up lost under the couch. But that evening she hopped straight into the little room, curious to know what was happening.

"Did you hear that?" whispered Ziggy.

From under the bed came a merry sound. "Choo-choo! Choo-choo!"

A little train popped out of the shadow and began to race across the rug. With each loop it grew bigger, until it was big enough to climb aboard. It was Toby the Magic Train, with smoke that smelled of sugar. He opened his windows like eyes and said:

"Choo choo, good evening! Climb up, here we go!
To a valley so quiet, the quietest I know.
A song in the mountains lies sleeping, it seems,
and waits for a friend to wake it from dreams."

The children looked at each other with sparkling eyes. A place with no voice? A sleeping song? They couldn't wait to find out what it meant. They all climbed onto the train, and at the last moment Ciabù hopped aboard too.

"I'm coming too," said the slipper. "I'm an intrepid slipper!"

"What does intrepid mean?" asked Dash, who had never heard that word before.

"Intrepid means she's not afraid of anything," explained Lily. "It means brave."

Ciabù gave a little bow, very proud.

Toby whistled and set off. He raced among the singing drops, rose above the clouds, and crossed the sky full of stars. They passed by the moon, which waved to them with a silver beam. Then the clouds opened, and below them appeared a green valley, tucked between two big mountains. The sun was setting and painting everything orange, pink, and purple, like a picture. It was a colorful sunset, so beautiful. But something was strange: the valley was silent. Too silent.

The train stopped gently on the grass. The children climbed down and looked around.

"Hello there!" shouted Lily with all the voice she had.

But nothing happened. No answer. Only a silence that gave a little shiver.

Skye huddled close to the others. "This silence is scary," she said softly.

"Don't be afraid," Lily reassured her, taking her hand. "We're all here together."

"How strange," Lily went on. "In a valley like this, when you shout, the mountains send your voice back to you. It's called an echo. You try to say a word, and the valley repeats it back. But here the echo doesn't answer."

The four friends tried together. "Hello!" they shouted. Silence. The valley seemed asleep and a little sad.

That was when they heard a little sob. Behind a bush was a squirrel with a ruffled tail and a voice as thin as a little whistle. Her name was Hazel.

"What happened to the valley?" asked Skye, coming closer gently.

"It's all Bruno's fault," said Hazel, sniffling. "One morning I sang my song, and he copied me to make fun of me. He repeated every word of mine to make me angry! So I won't talk to him anymore."

Not far away, under a big tree, they found Bruno. He was a huge deer, with antlers as wide as branches and a voice as deep as a drum. He was sad too, holding his head toward the ground.

"It's all Hazel's fault," grumbled Bruno. "I greeted the morning with a fine call, and she imitated me to laugh at me. What a mean trick! So I won't talk to her anymore."

Lily listened to them both, then stopped to think. And all at once she understood.

"Wait," she said. "Nobody copied you. It was the echo! When you sang, the valley sent your own voice back to you. You weren't making fun of each other. It was the mountain answering you!"

But Hazel and Bruno were so angry that they wouldn't believe her.

"That's not true," said Hazel, turning the other way.

"I'm not falling for it," said Bruno, lowering his antlers.

Meanwhile the sky was growing darker. The pink and orange gave way to the purple of evening. Soon night would come, and the two friends would stay angry forever.

Lily clenched her fists. She never gave up.

"I'll show you that I'm right," she said. "Everyone come to Echo Rock, the big rock in the middle of the valley. From there the voice flies farther."

But to reach the rock they had to cross a stream, hopping on some wet stones. Hazel was afraid of the water and trembled.

"I've got you," said Lily, taking her gently in her hands. "I won't let you fall."

Ziggy found a long branch and laid it between the farthest stones, to make a bridge. Dash wanted to jump first, to show it was easy, but he slipped and landed sitting in the water, all wet. "At least I had a bath!" he said, laughing, and even Hazel let a smile slip out. Skye walked slowly, holding big Bruno's hoof, whose legs were trembling.

Halfway across the stream, a stone shifted under Lily's feet. For a moment the little girl wobbled, her arms spread like the wings of a little bird. "Careful!" shouted Ziggy. But Lily, steady and stubborn, found her balance, took a breath, and kept going, without letting go of Hazel. One after another, they all reached Echo Rock.

"Now watch," said Lily. She stood up straight on the rock, took a big breath, and shouted: "I AM LILY!"

Everyone waited. But the valley stayed silent. No answer.

Lily's heart was beating fast. What if she was wrong? She tried again, even louder. "ARE YOU THERE?" But this time too there was only silence, a silence that weighed like a cloud.

"See? The echo doesn't exist," said Bruno, disappointed.

Then Ciabù, the intrepid slipper, hopped forward. "Maybe the echo is only asleep," she said. "Beautiful things sometimes need someone to wake them gently."

Lily understood. The echo of that valley was not just any echo: it lived on the friendship between Hazel and Bruno. When the two had quarreled, the echo had fallen asleep from sadness.

"Hazel, Bruno," said Lily in a sweet voice, "try to call to each other. Not to quarrel. To make peace."

The two friends looked at each other. It took courage. Then Hazel, in her little voice, said softly: "I'm sorry, Bruno."

And something magical happened. From the mountain came a soft voice: "...sorry, Bruno... sorry..."

Bruno's eyes went wide. Then, in his deep voice, he answered: "I'm sorry too, Hazel!"

And the valley answered: "...sorry too, Hazel... Hazel... Hazel..."

The echo was waking up! Hazel and Bruno burst out laughing, and the more they laughed, the more the echo laughed with them, louder and louder, bouncing between the two mountains like a happy ball. From every corner of the valley the animals came out: rabbits, little birds, hedgehogs, and baby deer. They had stayed quiet and hidden for many days, and now they sang all together again.

"You brought the voice back to the valley!" chirped Hazel, jumping onto Skye's shoulder.

The children petted the animals calmly and with respect, without frightening them. Bruno lowered his antlers to be touched, and Lily rested her hand on his warm nose. Skye hugged Hazel, who was still trembling a little, but now with happiness.

"The animals of the valley are our friends," said Lily, smiling. "And friends treat each other with love and respect: they listen to each other, they help each other, and they don't leave each other behind in hard times. And almost always, when someone seems mean, it's just a little misunderstanding to clear up gently."

The sky was dark now, but full of stars. Toby the Magic Train whistled gently: it was time to go home.

They all climbed aboard, and while the valley sang behind them, Toby said:

"Choo choo, we head home by the silver moon's light,
the valley is singing, its heart glowing bright.
Whoever will listen, and treat little friends well,
finds a voice and a smile... that's the tale I will tell!"

The train flew among the stars and carried the children back to the little room. Outside, the singing rain was still making its soft music on the roofs. Ciabù hopped happily to her spot beside the bed, tired but happy with her adventure.

Lily, Ziggy, Skye, and Dash slipped under the covers. Their eyes were closing, but in their hearts they still held the song of the valley.

And if that night they listened closely, between one raindrop and the next, they seemed to hear a little faraway voice saying: "Thank you... thank you... thank you..."