Night of Light
Philip José Farmer
 In a world in orbit around a binary system, once every 7 years it is bathed in a bizarre radiance that rearranges physical reality. To cope with this, most inhabitants go to sleep for the entire two week period. To stay asleep, some of the inhabitants take a special medicine that keeps them under for the whole two week period. Only mystics, newcomers, and devotees to the bizarre religion are willing to stay awake and endure the two weeks of brilliance, where things materialize out of thin air. According to their religion, people undergo an unpredictable change, and many actually die. The good become better, and the bad become worse. One woman's husband metamorphosized into a tree. Another person was chased down streets by statues that came to life. But facing the brilliance is also a rite of passage if you must develop as a being inclined towards acts of goodness, or a being inclined towards acts of evil. It is during those two weeks that the good are pitted against the bad, and it is also a time when their living god must face his successor. To help in the conversion effort, Catholic missionaries have been sent to the planet to help reconcile the planet's religion with their own universal faith. The only problem is that the planet's religion appears to be spreading across the stars.