This omnibus contains three novels of the Estcarp cycle: Three Against the Witch World, Warlock of the Witch World, and Sorceress of the Witch World. It was published in 1998 by Science Fiction Book Club; ISBN 1568656580; 522 pages; 5.7 x 8.5 inches; hardcover. It has cover art by Gary A. Lippincott. The book came with a poster of the cover art which I have not seen, as the book is brand new, sealed in cellophane.