The books are graded at six vocabulary levels, ranging from 250 key words (Beginning) to 2,500 key words (Advanced.) OXFORD BOOKWORMS LIBRARY New Edition STAGE 3 BESTSELLER PACK (1,000 key words) contains one copy each of the following ten titles: The Call of the Wild Chemical Secret A Christmas Carol Frankenstein Love Story The Picture of Dorian Gray The Prisoner of Zenda The Secret Garden Skyjack! Tales of Mystery and Imagination