Set in 18th century Scotland, the novel explores the psychological downfall of a deeply religious man who believes he is predestined for salvation and thus justified in committing a series of murders. He is driven to this path of self-destruction by a mysterious stranger who may be either a devilish tempter or a manifestation of his own deranged mind. The book serves as a critique of religious fanaticism and a chilling exploration of the dark side of human nature.

"A Voyage to Arcturus" is a philosophical and allegorical novel that follows the journey of a man named Maskull to the planet Tormance, located in the star system Arcturus. As he explores this strange and mystical world, Maskull encounters various beings and experiences profound transformations, both physically and spiritually. Through vivid and imaginative storytelling, the book delves into themes of identity, morality, and the nature of reality, challenging readers to question their own perceptions and beliefs.