What do you do when you have written the last truly great space opera of the 20th Century? If you are Peter F. Hamilton, the answer seems to be to try and write the first great space opera of the 21st. He may have been pipped to the post by Alastair Reynolds' Inhibitor series in that regard, but The Commonwealth Saga, starting with Pandora's Star to be concluded in Judas Unchained, is an extremely impressive piece of work. In his Night's Dawn Trilogy Hamilton populated his universe with starships swallowing the void in artificial wormholes. In Pandora's Star wormholes directly link planets together, meaning visiting another world is as simple as getting on a train. There are no starships and the Intersolar Commonwealth is a peaceful, stable society. When two stars 1200 light-years away disappear, the Commonwealth builds the first faster-than-light ship to investigate. As the title suggests, this isn't a great idea and soon the Commonwealth is under threat of annihilation. Like Night's Dawn, this new series is complex, richly populated with interesting characters and with an effortless style which pulls you in and makes you care about what's happening, a skill most hard SF authors lack (hello Gregory Benford!). The ending is shocking, the humour is impressive (especially the prologue which must rank as one of the best SF novel openings ever) and the 18-month wait for book two will be interminable. Extremely impressive.