What is the main conflict in The Neutronium Alchemist Conflict by Peter F. Hamilton?

The Neutronium Alchemist: Conflict is the fourth book of a six-part science fiction series by Peter F. Hamilton. Ths was originally released as three longer books in the U.K. The series tells the story of the terrible effects of souls returning from the dead to possess the bodies of the living. This book explores the conflicts that arise from this situation, as well as the new alliances that must be forged in order to combat the threat. The main storyline of the book revolves around the attempt to capture a scientist called Mzu, who has invented a powerful super-weapon that she intends to use for her own revenge. Joshua, Monica and Samuel must stop her and neutralize the threat of the weapon before it falls into the hands of the possessed. Meanwhile, many other characters' side plots are followed as they cope with the effects on their own lives of the conflict between living and possessed.