It is the year of the Great Comet. CIA agent Tom Shepherd and Interpol's Alessandra Deniel investigate the massive disaster in Vienna and the theft of the Holy Lance. They discover the brilliant, obsessed mastermind whose ultimate goal seems to be the perversion of what is divine. As they race to stop him, panic and chaos grip the world at the approach of the Great Comet. In the end, will one side win the struggle, or will all of mankind lose?