The penalty for Dani Cumali's murder: £84,000.

Theo works 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.

These days, there's no need to go to prison - provided that you can afford to pay the penalty for the crime you've committed. If you're rich enough, you can get away with murder.

But Dani's murder is different. When Theo finds her lifeless body, and a hired killer standing over her and calmly calling the police to confess, he can't let her death become just an entry on a balance sheet.

Someone is responsible. And Theo is going to find them and make them pay.