The Dark Frontier: Level 6

The graded readers in this series aim to provide learners of English with a pleasurable reading experience. The series, which should appeal to a wide age range, exposes students to a variety of styles and kinds of English and the books contain puzzles and exercises based on the text. The grading system is based on lexical controls, structural controls and guidelines on sentence length and complexity. Books in Level 6 have a vocabulary of 2500 words.