In the fifties alien invasion movies were two a penny and it was better to shoot first and ask questions later. Then came 'Close Encounters' and 'E.T.' and the fashion changed (in books and in films) to much more sympathetic and optimistic scenarios for alien contact. Anyway, just when you thought it might be safe to go out into the galaxy again... The Forge of God brings back those nasty aliens with a vengeance proving that you can't be too paranoid. This lot have learned a thing or two since the fifties though. Now they can play politics and on the surface its all quite beneficent until they find the right moment to stick the knife in. They seem so charming as well, until a few clues leak out... There is a follow up book (Anvil Of Stars) which is every bit as good as this one. The criminals are pursued back to their own system but they don't get any easier to deal with. I probably enjoyed these books for all the wrong (politically incorrect) reasons. It was nice to have some good old fashioned honest to goodness, no redeeming features, evil aliens around again.