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It's difficult to summarize what SHIBUMI is about, because thinking straightforwardly about this novel is to fool yourself. The chain of events goes more or less like this. An Israeli commando is looking for retribution for the Munich Olympics murders, but are massacred by a mysterious government agency in the process. Hannah Stern, the only survivor, seeks refuge with an old friend of her uncle, Nicholai Hel, who happens to be the world's best paid assassin and tenth level black belt in sex. Nothing less.
What makes SHIBUMI great is that those events are the main plot, but take the backseat to the amazing character development. SHIBUMI is about Nicholai Hel's intellectual and spiritual development into becoming the world's most dangerous man. If you keep that out of sight and keep longing for story developments, you will find SHIBUMI long and confusing because it has little regards for the genre it actually pretends it is. I know what you're thinking. How can such a cliché can power a 450 pages long novel and keep things interesting?