What is the main conflict in Song of Kali by Dan Simmons?

Song of Kali by Dan Simmons is a horror novel about an American poet, Robert C. "Bobby" Luczak, his Indian-born wife Amrita, and their baby, Victoria, who become caught up in the violent cult of the goddess Kali in Calcutta, India. It vividly depicts the horrors of a city that Bobby wishes could be obliterated from the earth and the family's personal tragedy when Victoria is kidnapped and killed.