Amal: the practical sister who digs up the "diamond key" that unlocks the mystery of Pakicetus, a whale-dog creature who once swam the ancient seas that are now Pakistan. Mehwish: the blind younger sister, who moves with the sun and music inside her. Zahoor: their heretical grandfather, a scientist who loves variation and "vim zee" and his two granddaughters most of all. Noman: the young man who steps into a lecture hall, decides "their triangle needs a fourth point," and changes all their lives. These are the four shifting chambers that make the heart of The Geometry of God. Through these vivid, contradictory, and original characters, Khan celebrates the complexities of familial and erotic love, the tug of curiosity and duty, the intersections of faith and longing. Her exuberant language draws from Urdu and Punjabi and invents one of its own for Mehwish, whose fractured English divides and slows and reveals.