"Kalki" is narrated by Theodora (Teddy) Ottinger, a Southern Californian aviator ("aviatrix" in the text) and author, who, after publishing a book called "Beyond Motherhood", comes to the attention of Kalki, the leader of a Kathmandu-based religious cult. The cult secretly makes its money through selling drugs and then gives it away using "lotus lotteries". Kalki claims to be God and that he is the final Avatar of Vishnu, who is going to end the human race on April 3. The planet will then be rid of the wicked and a fresh, clean start will usher in a new golden age. Ottinger suspects that Kalki will create a worldwide nuclear chain reaction which will annihilate every living thing and leave the planet uninhabitable.