Earth is Queen of the Universe, but someone is trying to destroy her.By shattering time forever! Travel at light speeds is common, & Earth is first in the universe, reigning over many worlds. But in order to rule effectively, Captain Robin Weinbaum, head of Security, needed an extremely advanced communications s ystem. He got it w/the Dirac transmitter, the first machine capable of sending instantaneous messages anywhere in the universe. The only problem was that someone called J. Shelby Stevens had a machine that could do the impossible--tap the transmissions before they were even made! It was Weinbaum's job to find Stevens. And unless he did, time would be abolished & the universe closed to Earth forever!
Used availability for James Blish's The Quincunx of Time
May 1975 : UK Hardback
October 1983 : USA Paperback
October 1976 : UK Paperback
September 2011 : Australia, UK Kindle edition