A spaceship lands outside the Royal Ontario Museum in Toronto. An alien being emerges and says, in perfect English, "Take me to a paleontologist." Hollus is traveling from star to star on a quest to scientifically prove that God exists. Tom Jericho, the human scientist with whom he ends up working, is convinced there is no God. Their debates, and their growing friendship, drive the narrative in this fast-paced, morally and intellectually challenging story of ambitious scope and touching humanity. Calculating God is SF on a grand scale.