The Algebraist (English, Paperback, Iain M. Banks)

Seconded to a military-religious order he’s barely heard of, Fassin Taak must travel amongst the Dwellers of the gas giant Nasqueron, in search of a secret hidden for half a billion years. Any help they offer will be on their own terms and in their own time.

But time is one thing Fassin Taak doesn’t have, with each passing day bringing the system closer to war – a war that threatens to overwhelm everything and everyone he’s ever known.
Source- Goodreads.com
L28,L35