num_pages: 406
description: Hardcover, fantasy fiction.
language: English
title: A Calculus of Angels
titlecomplete: A Calculus of Angels (Age of Unreason, #2)
genres: Historical, Science Fiction, Historical Fantasy, Science Fiction Fantasy, Steampunk, Historical Fiction, Fiction, Alternate History, Fantasy, Speculative Fiction
ratings_count: 979
series: Age of Unreason
awards: awardedAt: 946713600000
name: Endeavour Award
publisher: Del Rey Books; The Ballantine Publishing Group