Pandora's Star (2004)

Astronomical observations, an investigator's work and the routines of a prosperous interstellar society slowly reveal how much they have in common. Hamilton's Commonwealth Saga joins Pandora's Star to Judas Unchained as one completed two-book arc. That count understates the commitment: both are enormous, with many viewpoints and long preparations. Choose it for the satisfaction of tracing infrastructure, institutions and apparently separate lives into a crisis that requires the whole network.