Which Narnia novel features the character Eustace Scrubb’s transformation into a dragon?

The Voyage of the Dawn Treader features Eustace Scrubb’s transformation into a dragon.

Eustace appears as an unpleasant and self-centered boy when he first enters Narnia. During the voyage, he discovers a dragon’s treasure and becomes a dragon himself. The experience forces him to confront his character and eventually change.

The novel was published in 1952 and is the third book in publication order. It follows King Caspian X and the crew of the Dawn Treader as they sail eastward to explore islands beyond Narnia. Eustace later returns in The Silver Chair, where he helps introduce Jill Pole to Narnia.