The books is comprehensibly detailed and switches between the events of that tragic day, the years leading up to it and the police investigation and public recovery afterwards. Sources of information are clearly stated and easily checked for those who read non-fiction for reference rather than pleasure. Cullen does not shy away from the tough aspects of the events, how police and psychologists missed warning signs in the killers, how one victim was left to bleed to death by the SWAT team and how one victim's religious legacy comes from a simple confusion in the chaos. He also stays away from vilifying the killers and parents, showing that they were human not evil, which gave a more balanced view to the book.
David Cullen has a website that accompanies the book, which not only contains some of his information sources, but also has detailed resources for educators teaching Columbine as part of the curriculum. Although I would say the contents of the book was not appropriate for younger teens.
I got through the book in under a day as it is gripping, vivid and readable, and I would strongly recommend it to anyone wishing to know the truth about this tragedy, as well as those who like true crime books.
Columbine is available from Amazon UK for £6.99.