The Asutra is a 1974 novel by Jack Vance.
The Asutra is a novel in which the hero must overthrow the rulers of his world.
Dave Langford reviewed The Asutra for White Dwarf #99, and stated that "Some of the freshness leaked out of this series by book 3: The Asutra isn't actively bad but seems perfunctory, the result of over-hasty production."