The Tulpa: A Novel of Fantasy (Unabridged‪)‬

Araminta Palomer, the oversheltered child of a wealthy family, enlivens her life by imagining a near-invisible animal playmate: Willbe. But "Minta" possesses an unsuspected psychic talent, and so she unwittingly creates a tulpa, an envisioned being that gradually becomes tangible, first to herself and then to others.

Willbe seems a loving companion at first, but as Minta matures, he changes into an increasingly perilous and unreliable friend. Learning to un-create Willbe becomes Araminta's lifelong ambition, as he threatens her governess, her family - and even herself!