A rather good read, the diversity of narrative arcs is impressive and refreshing. The cliches which have plagued the genre since its arrival in Hollywood are not found in full. There is no immediately obvious enemy, the greatest threat remains nebulous even on the last page, and the secondary danger explodes into the story late in the novel. As for consistency with the laws of physics, aside from the single suspension of disbelief of ‘the stepper device’ it is flawless. Honestly, the novel reaches beyond the genre into the realm of literature, as a metaphor for the search for identity can be carried across every page.