Which successful WB Television Network series includes a horror trilogy published as a book in 2001?
Unseen (Buffy/Angel novel):  It is part of the Buffy the Vampire Slayer series. Buffy the Vampire Slayer: The series received critical and popular acclaim, frequently being listed as one of the greatest TV shows of all time, and usually reached between four and six million viewers on original airings.
i don't know