When Russell Stone becomes the teacher of a young Algerian woman with a disturbingly luminous presence, he is both entranced and troubled. How can this refugee from terror radiate such bliss? Is it possible to be so open and alive without coming to serious harm? Soon, Thassa's joyful personality comes to the attention of the notorious geneticist and advocate for genomic enhancement, Thomas Kurton, whose research has enabled him to announce his discovery of the genetic underpinnings of happiness... GENEROSITY is Richard Powers' most exuberant and exhilarating book yet. 'Powers is one of the best writers working now.' Audrey Niffenegger.