The Prefect by Alastair Reynolds

Another Revelation Space novel this one is set in the fabulous Glitter band of Yellowstone when it is at the height of its power and influence. It is half detective novel and half space opera. Tom Dreyfus is a cop. One of the prefects tasked with keeping the peace in this collection of independent asteroid habitats and in particular with protecting the integrity of the democratic voting system which governs the band. What starts out as a straight forward vote tampering case legend out to have much more serious consequences as a malign super-intelligence makes a bid to takeover the entire Glitter band. Great Sci Fi Entertainment as can be expected from Reynolds.