This book was interesting in that it told the story from the point of view of different characters - most of whom were addicted to heroine. They led a hard life, having to live on the streets, and the girls eventually started "on the game" to feed their addiction.
But I think the same subject was approached better by other authors, especially "Crank" and "Glass" by Ellen Hopkins. I realize that they are written about another drug, they're set in the US, they're a more current era...but the basic plot was the same.
Still a decent book, but if you're wanting to read about the hard truth of drug addiction in a fictional book, then there are better books.