In writing A Magick Life Martin Booth sets himself a challenge. Biographies of figures like Aleister Crowley can be difficult because he was one of those people who devote their lives to subjects which believers take extremely seriously, but which sceptics tend to simply find amusing and/or disturbing (depending on just how prudish their instincts are).
In the case of Crowley, the subject in question is occultism and ritual magic, including sex magic rituals. This is the sort of subject matter people tend not to have mild, moderate, wishy-washy opinions about. For occultists, Crowley is either a hugely important figure in terms of recent innovations in the subject (Thelemites follow his system to this day, yet more draw on it, and chaos magicians tend to see his work as a necessary precursor to the sort of postmodern take they utilise) or one of the worst disasters to ever befall the field. Those who do not lend credence to occultism still tend to pass judgement on it; “it’s creepy and culty and manipulative” say some, “it’s an amusing eccentricity” say others, “it’s the work of the Devil” say yet others, “it’s asinine self-aggrandising nonsense” say still others.