"Juba Good" by Vicki Delany, Rapid Reads, Orca Book Publishing, 2014.
A terrific novella about the thankless task of policing in one of the world's newest nations, South Sudan.
Ray Robertson is a Canadian cop finishing a year as an advisor to the new police force of the city of Juba. His routine is shattered by the serial killings of several prostitutes. Ray is a patrol sergeant with no experience as a detective, but he is the best they have. Complicating matters: such modern techniques as DNA analysis are beyond the local labs, so if the bad guy is going to be caught it's going to take interrogations, fingertip searches of crime scenes, and plain old cop-thinking.
And the bad guy knows Ray is a threat, and is taking steps of his own...