84K by Claire North

From one of the most original new voices in modern fiction comes a startling vision of a world where you can get away with anything . . . Theo Miller knows the value of human life – to the very last penny. Working in the Criminal Audit Office, he assesses each crime that crosses his desk and makes sure the correct debt to society is paid in full. But when his ex-lover is killed, it’s different. This is one death he can’t let become merely an entry on a balance sheet. Because when the richest in the world are getting away with murder, sometimes the numbers just don’t add up. 

(Description courtesy of Orbit Books)