Mercer, Sienna. My sister the vampire : switched / Sienna Mercer - New York HarperCollins Publishers 2007 - 199 pages : 19 x 13 cm. - My sister the vampire ; #1 . ISBN: 978-0-06-087113-0 Subjects--Topical Terms: Twins--FictionVampires--Fiction. Dewey Class. No.: Fic. M5541m