Question: Patricia Burford Ryan, an American writer of romance novels,  is the twin sister of the romance writer Pamela Burford whose books are currently available as what type of books?
Sentence (from "Mary Tate Engels"): Mary Tate Engels (born March 27, 1943) is an American writer of almost thirty romance novels since 1982 as Tate McKenna and Mary Tate Engels.
Relevant evidence: No