Bori, in the Mawri society of Niger, are mischievous and invisible beings that populate the bush. Bori is also the practice of taming these wild forces in the context of possession ceremonies. In Prayer Has Spoiled Everything Adeline Masquelier offers an account of how this phenomenon intervenes-sometimes subtly, sometimes dramatically-in human lives, providing a constantly renewed source of meaning for Mawri peasants confronted with cultural...