: A boy with an unusual voice finds himself in a country where a pirate seized power, forcing everyone to lie. With the help of a magical voice, the boy destroys the lie, and truth reigns in the country.

In a small Italian village, a boy is born, Gelsomino, with an incredibly loud voice, from which everything around collapses. The school teacher believes that his voice will bring him either great happiness or many troubles. He advises the boy to be silent, because no one has been scolded for silence. Neighbors accuse him of witchcraft. Jelsomino wants to learn to sing. His relatives died, and he goes to roam the world to become a singer.

Jelsomino comes to the Land of Liars, where the opposite is true. In the stationery store, they sell him food, and in the grocery store, ink and notebooks. People call morning in the evening, and evening in the morning. Out of an excess of feelings, Gelsomino quietly says “Aaaa,” and a Zoppino kitten with three paws drawn in chalk falls from the wall. From him, Jelsomino learns the history of the Land of Liars.

Many years ago, the pirate Giacomone appeared in the country. He seized power, and so that it would not occur to anyone to tell the truth about him, he ordered a new dictionary to be published, where all the words were reversed, so morning is now called evening, and vice versa. For the truth, people were sent to prison. Not only people, but also animals were forced to lie. Now the dogs meow, and the cats bark.

Zoppino and Gelsomino are anxious for food. They meet Aunt Pannakyu (Corn), which feeds cats. To scare them away, Tsoppino meows. After escaping with food and losing Jelsomino, Tsoppino finds himself near the wall surrounding the royal palace. Climbing it, he looks into Giacomono’s bedroom and sees that the golden hair that the king is so proud of is a wig. With his chalk paw, he writes on the walls that the king is wearing a wig.

In the morning, people read the inscriptions and start laughing at the king. He becomes furious and orders to find the one who made them. Aunt Pannakya notices Zoppino, who writes on the walls, and takes him home so that Zoppino will teach her to meow her domestic cats. At home with Aunt Pannakya Zoppino meets her niece Romoletta, who painted him on the wall.

Hearing that the aunts' cats Pannakya meow, the neighbor Senor Calimero writes a denunciation on her.

Romoletta goes to the artist Bananito, who lives in the neighborhood, to borrow paints and draw Zoppino's fourth foot. Bananito himself was considering his paintings at this time, on which a horse with thirteen legs and a man with three noses were painted. He decides to cut them.

Meanwhile, the director of the opera house, maestro Domisol, hears the voice of Gelsomino, and invites him to his theater. Maestro Domisol is putting up posters throughout the city, stating that the tenor Dzhelsomino, the worst in the world, who has thrown rotten eggs around the world, will not give a concert, the audience is asked not to come, and entrance tickets are worth nothing.At the concert, King Giacomon is present, and from the voice of Gelsomino, a wig blows him. After the next song, the theater collapses. From horror, Jelsomino rushes to flee, and maestro Domisol runs after him, demanding compensation for losses.

Running away, Gelsomino gets into the workshop of Bananito, where he meets with Zoppino. Gelsomino offers the artist to draw the truth. Live animals jump off the corrected paintings. Now everything that Bananito draws comes to life. The artist draws the fourth paw of Zoppino.

Reading a newspaper where lies are written instead of the truth, Tsoppino learns that Jelsomino is being sought because of the destroyed theater, while Aunt Pannokya and Romoletta taught cats to meow and were put into a madhouse for it.

Calimero demands a good reward for his denunciation, but the truth is written in it, and the police chief puts Calimero in a madhouse. Police flayer rush to catch mewing cats and barking dogs. They put all the captured in the room to Calimero, who really goes crazy and begins to meow.

Gelsomino, running away from the police, hurts his leg and gets into the house of the old junkman Benvenuto. Benvenuto is sick with a new disease - if he sits, he is aging. Therefore, Benvenuto always stands, and if he sits down, then only to help someone. From this, he has gray hair.

Bananito paints on the street, and his truthful drawings come to life. For this he is sent to prison. Seeing his drawings, the head of the prison leads the artist to Giacomon. The king orders to paint an unprecedented zoological garden and appoints him Minister of Food. Bananito has to draw food for people, but only true orders come to life, and then the artist is ordered to draw weapons.Bananito flatly refuses, and Giacomon sends him to a madhouse.

Zoppino makes his way there and finds the artist. Bananito with the help of the legs of a kitten draws everything that is required to escape, and escapes. He hides in a Benvenuto wheelbarrow, under the rags. Hiding the artist, the old man has to sit, and he dies.

Jelsomino comes to a madhouse and starts to sing. From his voice the building collapses, the prisoners scatter, and people rush to get rid of the lies. Now Gelsomino sings near the royal palace. Unrecognized, Giacomon escapes.

The state of liars is destroyed, there remains only a column, which describes the deeds of Giacomon, to remind people of the past and not return to lies.

Bananito restored the palace, Aunt Pannockya became the director of the Institute for the Protection of Homeless Cats, Romoletta became a teacher at the school, and Gelsomino seriously took up music. Counting on the weapons that the artist Bananito will draw, Giacomon managed to declare war on a neighboring state. But Gelsomino instead of war arranges a football match.