A far future hard SF epic, The Collapsium takes quantum physics forward into a gloriously realised future where a new imperium based on Earth is built on the dream of collapsium - a building material made from black holes. It is a dream that may soon be about to end as the collapsium ring that circles the sun is in danger of collapsing into it sparking an apocalyptic chain reaction. What follows is a remarkable fusion of hard science, extravagant imagination and baroque court politics. The Collapsim marks out Wil McCarthy as one of the brightest of the new generation of SF talents.