When the two characters arrive in America, the book launches into a wonderful satire on imperial pomposity and religious fundamentalism. Milton and his fellow Puritans become increasingly paranoid about the "evil" that lurks in the ways of the "heathen natives" and the nearby Catholic township. Needless to say, their Paradise Found crumbles around them as their paranoia drives them to wage war on everybody who is not a Puritan clone. The slow revelation of the way in which Milton projects his own demons onto those around them and his utter hypocrisy is extremely cleverly done.
Highly recommended, especially in the current climate of neo-conservatism.