Guardian — A.J. Hartley

In A. J. Hartley's thrilling and intriguing 19th-century South African-inspired fantasy world,
which started with the Thriller Award-winning STEEPLEJACK and continues with GUARDIAN, Anglet Sutonga is a teenage detective fighting in a race against time as her beloved city is pushed to the brink.

This is what Ang knows:
A dear friend is accused of murdering the Prime Minister of Bar-Selehm.
A mysterious but fatal illness is infecting the poor.
A fanatical politician seizes power, unleashing a wave of violent repression over the city.

This is what Ang must do:
Protect her family.
Solve a murder.
RESIST, no matter what, before it's too late.