Dwellers in the Mirage

From the back cover of the Avon 1976 printing: Angry warrior, modern man - Leif Langdon was suddenly ripped from the 20th century and plunged into the ancient world of The Mirage. But his entrance into this awesome land awakened the slumbering Dwayanu, who in this strange incarnation was also Lief. This, two-men-in-one battle with the beautiful witch-woman Lur and the ethereal beauty Evalie for the glory of the Mirage.