What did stranger wanted the deed to in tuck everlasting?

In "Tuck Everlasting," the stranger, later revealed to be the Man in the Yellow Suit, seeks the deed to the Tuck family's land because he wants to exploit the secret of immortality that the Tucks possess. He believes that by obtaining the land, he can control the source of the magical spring that grants eternal life. His plan is to commercialize the spring, offering immortality to others, regardless of the consequences. Ultimately, he represents the conflict between the desire for eternal life and the natural cycle of life and death.