NEW YORK (AP) _ Simon & Schuster has extended an unusual profit-sharing deal with Stephen King, contracting for three more books from the bestselling horror writer.

``This new agreement is a testimony to the strength and success of our partnership,'' Simon & Schuster president and CEO Jack Romanos said Thursday. ``We look forward to being Stephen's publishing home for many years to come.''

King left Viking/Penguin, his publisher for 20 years, in 1997. His initial agreement with Simon & Schuster was reportedly for King and the company to evenly split profits from his books, with the author receiving only ``token'' advances and royalties.

In standard publishing practice, authors are paid a large advance against sales of their book up front, and are paid royalties only when enough books have been sold to earn back the company's advance.

Simon & Schuster, the publishing unit of Viacom Inc., did not disclose financial terms of the extension. The company said it had published eight King titles since the 1997 three-book agreement.

The extension covers three works of fiction, to be published in hardcover under the Scribner imprint, by Pocket Books in paperback and by Simon & Schuster Audio as audio books.

``I'm delighted to know that my future with Scribner, Pocket Books and Simon & Schuster Audio is secure,'' King said in the release.

The author of ``Carrie,'' ``The Shining,'' and ``Misery,'' seriously injured when he was struck by a van in Maine in June, has begun writing again.

Simon & Schuster plans to publish a non-fiction book by King, called ``On Writing,'' this year. The first novel scheduled to be published under the new agreement is titled ``From a Buick Eight.'' Simon & Schuster spokesman Adam Rothberg said no publication date had been set.