It is hard to tell what this one is about from the blurb. Between the covers is postmodern science fiction well grounded in current physics. A mysterious entity known as “The Festival” arrives on the backwater colony of a neo-Victorian Empire, quite literally showering manna from heaven on the populace in return for “entertainment” in the form of information. The Empire attempts to retaliate, and all the while a pair of agents, one for the UN, hover and observe. These agents work a pair of mysterious powers that seek to ensure that humanity is not destroyed by the mysterious Eschaton, an powerful entity that brutally punishes causality violations. Technology now allows time travel as a biproduct of (apparent) faster than light travel, and the Eschaton is merciless on those who violate its causality edicts.
In the middle of this dangerous universe, the two secret agents develop a strong personal relationship. Stross skillfully manages to focus on their story and it’s pertinence while the worlds around them spirals towards an uncertain future. At the same time, he does not forget to show the humorous side of those who refuse to accept self-evident realities. Innovative and deeply insightful, but ultimately pretty boring. My big gripe is that I didn’t feel any empathy whatsoever for the characters.