What is the theme in Candy by Luke Davies?

Another theme in the book is methodicalness. In the most unlikely place, a sense of the methodical appears. The narrator is absolutely methodical when it comes to cooking cocaine and heroin and find veins to shoot. He has a system for all these things. In fact, he goes into great detail about how to cook both cocaine and heroin, working as a chemist. He feels comfortable in this methodical role and somehow it brings stability to his otherwise unstable life.