When the rise of far-right political unrest in Britain caused by the Brexit referendum culminates in the murder of MP Jo Cox, activist Matthew Collins infiltrates an ultra-far-right group to prevent further outrages.

DI Rachita Ray is promoted to join a homicide investigation. Though she suspects she's been chosen for her ethnicity, Rachita is determined to find the killer by delving into the world of organised crime and challenging her colleagues' biases.