"Through A Dark Portal" is a story of two romances, separated by six hundred years, but linked through a supernatural bond of love, which allows the tragedy of the earlier time to be brought to a happy fulfillment in the present day. The book is set in England, partly in the present day and partly in the late fourteenth century, at the castle and estate of John, Duke of Langland. Arwen Campbell, a TV producer and historian, comes to Langland to use the castle in a television film on the life and times of John Langland's ancestor, the second Duke. From their first meeting there is a very strong attraction between John and Arwen, too strong for so short an acquaintance. Arwen experiences strange feelings of panic and despair as she begins to remember details of life in the fourteenth century, in the persona of Philippa de Quincy, the second Duke's mistress. The present-day romance becomes more and more entangled with past tragedy, until, after a harrowing climax, the couple's deep love for one another triumphs over all difficulties, and the story ends with a glowing continuation of both romances, the old and the new.