It follows a carefully graded syllabus which allows for recycling of language. A complete comic-strip adventure story runs through each book, featuring ace detective Captain Shadow. This provides a memorable context for new language and maintains motivation. It involves children in a variety of other fun activities, such as songs, rhymes, games, and puzzles, which are all used to practise language in an enjoyable way. It gives children a thorough grounding in listening, speaking, reading and writing.