The story, divided into short, numbered "episodes" rather than chapters, is presented as a "story about Nikola Tesla" recounted by Richard Feynman to a group of other Manhattan Project scientists in the wake of World War II. It involves the efforts of a similar think-tank, the Kamikaze Group, to uncover the secret of a rumored "super-weapon" Tesla had developed before his death, one supposedly responsible for the mysterious Tunguska explosion of 1908. Feynman makes no claims for the tale's veracity, a caution warranted at the end of the book when his informant is revealed to have been pulp writer L. Ron Hubbard, a participant in the novel's events portrayed as a self-promoting, delusional narcissist.