It was a golden, warm afternoon. The sun warmed the garden and a light breeze made the leaves dance on the trees. Ziggy, Lily, Skye, and Dash were sitting on the grass, gathering leaves of every color: red, yellow, orange. They arranged them in little piles to build a big rainbow on the ground.

"This is the most beautiful leaf in the world!" cried Dash, waving a leaf almost as big as his face.

"Mine smells like the woods," said Skye in a low voice, sniffing it with a sweet smile.

"Look at my red pile!" laughed Ziggy, hopping around the leaves like a cricket.

Lily, with her blue eyes, looked at everything very carefully. "But why do leaves turn orange?" she asked. It was always like this: Lily wanted to understand everything, even the tiniest thing.

All at once the sky filled with clouds and the air smelled of wet earth. A storm was coming. But before a single drop could fall, from far away came a familiar sound:

"CHUFF CHUFF!"

It was Toby the Magic Train! He arrived puffing colored smoke, his wheels sparkling like stars. He stopped right in front of the children and, as always, spoke in rhyme:

"CHUFF CHUFF! Good morning, children dear,
hop aboard — adventure's here!
I'll take you far, where whispers play,
through woods of magic, not far away!"

The four friends looked at each other with shining eyes. An adventure! They climbed aboard in a rush and the little train sped off, crossing meadows, hills, and little bridges, until it stopped at the entrance of a forest.

"This is the Forest of Whispers," Lily read on a wooden sign.

It was a special place: the trees whispered when the wind passed through the leaves, and the paths changed color under your feet. But something was strange. The more the children walked, the duller the colors became. The green of the grass was fading toward grey, like a pencil drawing someone was stealing the colors from.

They reached the heart of the forest, where the Royal Garden stood, with a throne made all of flowers. But the flowers were sad and faded, and the air was still.

"Where are the butterflies?" asked Skye, looking around.

There wasn't a single one. The garden was silent and grey as ash.

Just then, from a big green water lily, came a little voice singing a funny, off-key song:

"Gra-cra-cree, gra-cra-crooo,
I'm a little frog and I sing too!"

It was Lalla, a little green frog hopping happily on the pond leaves. She smelled of mint and fresh water. When she saw the children, she made a big bow and almost fell into the water.

"Welcome to the twilight of the Forest of Whispers!" she said.

The children looked at each other, puzzled. "What does twilight mean?" asked Ziggy, scratching his head.

Lalla smiled. "Twilight is that magical moment in the evening, when the sun goes away and the sky turns orange, pink, and purple. It's a little bit day and a little bit night."

"What a beautiful word!" said Lily, and she repeated it twice so she wouldn't forget it.

"Lalla, can you tell us where the butterflies have gone?" asked Skye gently.

But as soon as she heard that question, the frog's face changed. She stopped singing, hopped close to Lily, and put a little paw on her mouth. "Shhh," she whispered. Then, in the faintest voice, she spoke into Lily's ear:

"The glowing butterflies kept all the colors of the forest alight. If they don't come back before the last light of twilight disappears, the forest will stay grey forever. But I don't say important things out loud. I only whisper them to those who are curious."

"Then tell us right now what to do!" said Dash, hopping impatiently.

Lalla gave a little leap back and whispered a riddle: "Search where the night cries drops of light, and you'll hear a music no one plays at night."

Ziggy, Dash, and Skye scratched their heads. "I don't understand any of it," huffed Dash. "It's too hard. We'll never do it."

But not Lily. Lily clenched her fists and said: "I want to understand. Drops of light... a music no one plays... Wait!" She closed her eyes and thought with all her might. "The drops that cry at night are the dew! And the music no one plays is the sound the dew makes when it falls!"

Lalla clapped her little paws, happy. "Shhh... well done, curious little girl!"

And as if by magic, a secret path opened before them, all lit up by tiny drops that tinkled like little bells: ting, ting, ting. It was the dew singing.

"See?" said Lily to her friends. "All it took was asking one more question and not giving up!"

The children followed the sparkling path. But all at once they stopped. In front of them ran a dark stream, and to cross it there was only a bridge made of tangled roots, swaying with every puff of wind.

"I'm not going over there," said Dash, taking a step back.

Skye trembled a little. Ziggy looked down at the dark water and swallowed.

Lily took a deep breath. "I'll go first. If I go slowly and always look ahead, I can do it." She put one foot on the bridge. The roots creaked: creeak. But Lily didn't stop. One step, then another, holding tight to the roots. The bridge swayed, but she kept going. "Come on!" she called when she reached the other side. "Put your feet where I put mine, and hold on tight!"

One after another, the others crossed too, encouraged by Lily's brave voice. They had made it, all together!

Meanwhile, though, the sky grew darker and darker, and the forest greyer and greyer. The colors were escaping like water from a bucket with a hole.

"We have to hurry," said Lily. "Lalla, what's the next secret?"

The frog whispered in her ear: "Among a thousand flowers losing their color, only one stays alive. It's the most stubborn in the forest."

"A petal that doesn't turn grey!" Lily understood at once. "Let's look for it!"

The children ran into a clearing full of faded flowers and looked everywhere. It was Skye, with her gentle, watchful eyes, who saw something shining in the middle of the grey. "There! There's a petal still pink!"

It was a small, glowing petal, the only one left with color in the whole forest. Lily picked it up gently, as if it were a treasure. "This is for the potion of light, right, Lalla?"

"Shhh... maybe so. But one thing is still missing," whispered the frog. And she hopped onto a big leaf, in the middle of the pond.

By now the forest was almost all grey. In the sky only a thread of orange light remained, thin as a hair. The children were tired and a little scared.

"It's no use," said Dash, his eyes glistening. "We'll never solve the last riddle. Let's go home."

Ziggy and Skye were discouraged too, and sat down on the ground. But Lily knelt down next to Lalla and said in a steady voice: "Please, Lalla. Tell me the last secret. I won't give up."

The frog looked her straight in the eyes and whispered the hardest riddle of all: "The potion lights up with something you can't see, can't touch, and can't buy. You already have it inside you, but you must give it yourself."

Ziggy tried: "A stone?" No. Dash tried: "A flower?" No. Skye tried, shyly: "A drop of water?" No.

Lily thought, and thought, and thought some more. She looked at her friends, she looked at the dew tinkling, she looked at the pink petal between her fingers. "Something you can't see and can't touch... but that I can give..." All at once her eyes lit up. "I've got it! It's curiosity! The wish to ask questions and never give up! It's exactly what brought us all the way here!"

As soon as Lily said those words, the pink petal, the dew, and the last ray of light came together in a golden flash. POOF! From the pond rose a fragrant cloud, and from the sky a rain of colored petals began to fall, soft and sweet-smelling, brushing against their cheeks.

And then... there they were! A thousand glowing butterflies came fluttering back, each one more beautiful than the last. Wherever they passed, the colors lit up again: the green turned green, the flowers became red, yellow, and blue once more. The Forest of Whispers was alive and bright again!

The children jumped for joy among the falling petals. "We did it!" shouted Ziggy, turning cartwheels.

Lalla hopped onto Lily's shoulder and whispered one last secret: "You know what? I knew the answers all along. I was only waiting for someone curious enough to ask me. Thank you, stubborn little girl."

Lily smiled. She had learned something important: asking questions is never wrong, and whoever is curious always discovers something new.

When the light shone again in the sky, that friendly sound was heard once more:

"CHUFF CHUFF!"

It was Toby the Magic Train, come to pick them up. The children climbed aboard, tired but very happy, their pockets full of fragrant petals. Before leaving, the little train spoke in rhyme once more:

"CHUFF CHUFF! What a wonderful day,
a curious heart will find the way!
Who keeps on asking, gives their all,
finds hidden treasures, big and small!"

And while the Forest of Whispers shone with a thousand colors, Toby carried Ziggy, Lily, Skye, and Dash back home. That night they all dreamed of glowing butterflies and a frog who whispered secrets on the water lilies.