Critical Mass - Shadow Line Saga, Bk 6 Author:D. G. Chichester, Margaret Clark, Gray Morrow Henry Clerk prepares to set off the chain reaction that will destroy the U.S. The army tries to stop him, but they don't stand a chance. Power Line has to find the Order of St. George before Dr. Zero obliterates it, and Devlin must re-forge the armor of St. George, to use it to destroy Zero!