Lilia Desjardins knows that her husband's death wasn't an accident.

Unfortunately, no one else agrees with her, perhaps because she's viewed with suspicion by members of the Society for Nuclear Darwinists. In the year 2099 and following several nuclear detonations, people are assessed as 'norms' or 'shades', shades having mutations and being restricted as an underclass which suffers under a form of slavery. Lilia's notoriety rests on her discovery of 'Angel-shades', mutant humans with angel-like wings. Her mission now is to get to the bottom of her husband's death, but it is proving more difficult and dangerous than she could have imagined, particularly when she comes to the attention of policeman Adam Montgomery.

Adam isn't your average policeman. He knows a great deal more about the angel-shades than Lilia originally realizes, and he has his own secrets to keep. As he and Lilia find themselves working together to find the killer of several people linked to Lilia, they have to decide whether to trust one another and what Adam will do at the end of his mission.

The post-nuclear world of Fallen is really well-written with some interesting details. The central plot kept me guessing, although I did find some of its conclusions rather unlikely. The central romance takes a backseat to the action but is reasonably believable. Overall, the strong point of this novel is its setting and plot, and the author has clearly set us up for a sequel.