The novel presents a discussion of the philosophy of love and sex, written in the form of a series of letters between two men, "Herbert Wace," a young scientist, and "Dane Kempton," an elderly poet. Writer Jack London wrote "Wace's" letters, and Anna Strunsky wrote "Kempton's." In the late 19th century, the authors were part of a San Francisco radical literary group known as "The Crowd."
Kempton makes the case for feeling and emotion, while Wace proceeds "scientifically" and analyzes love in Darwinian terms:
âI purpose to order my affairs in a rational manner....Wherefore I marry Hester Stebbins. I am not impelled by the archaic sex madness of the beast, nor by the obsolescent romance madness of later-day man. I contract a tie which reason tells me is based upon health and sanity and compatibility. My intellect shall delight in that tie.â