This hardback edition contains the same story as the paperback editions which were issued later. This one is from Bantam and is a book club edition of 403 pages.
The premise is simple: imagine the US did not get involved in World War II and Hitler won. Fast forward to 1974 - only the USA and Australia survive beyond the bootheel of fascism and a last, desperate gamble is taken, to send a team back in time to change history.
This is Hogan at his best, one of his finest works. Before Harry Turtledove became so famous as the dean of alternate history, Hogan was writing first-rate A-H books himself, and this one ranks up there with anything Turtledove has written.