Fifteen is a story about four boys aged fifteen all from very different walks of life, yet are the best of friends. The story is set in the last few weeks of school before the summer holidays. The boys find a book with instructions on making things like fireworks, drugs from household foods and plastic explosives. The story focuses on some of the things they get up to experimenting with these, but also covers a wide variety of other challenges a fifteen year old has such as first sexual encounters. It is a comedy story with a much darker storyline weaved between the laughs.