Some of the themes only hinted at in Marie Corelli's 1886 breakthrough novel, A Romance of Two Worlds, are fully fleshed out in fascinating detail in her later work, The Life Everlasting. In the future world Corelli brings to life in this novel, scientific breakthroughs have made it possible to master radioactivity and other previously unharnessed energies. The female narrator opts to undergo a spiritual process that is designed to bring her to a higher plane of understanding, and along the way, she learns a great deal about her true nature and capabilities.