Rosewater (The Wormwood Trilogy, 1)

Tade Thompson's Rosewater is the start of an award-winning, cutting edge trilogy set in Nigeria, by one of science fiction's most engaging new voices.
*Arthur C. Clarke Award for Best Science Fiction Novel, winner*Nommo Award for Best Speculative Fiction Novel, winner
Rosewater is a town on the edge. A community formed around the edges of a mysterious alien biodome, its residents comprise the hopeful, the hungry and the helpless - people eager for a glimpse inside the dome or a taste of its rumored healing powers.
Kaaro is a government agent with a criminal past. He has seen inside the biodome, and doesn't care to again -- but when something begins killing off others like himself, Kaaro must defy his masters to search for an answer, facing his dark history and coming to a realization about a horrifying future.
The Wormwood TrilogyRosewaterThe Rosewater Insurrection