New series. Crowds gather for a mayoral debate between current incumbent Kashif Hassan and political underdog Caroline McCoy - only for the hustings to end in bloodshed when an assassin strikes. As Viv Deering and her team investigate, they are forced to infiltrate the far right, and their murky world of political benefactors, if they are to catch the culprit. Crime drama, starring Joanna Scanlan, Elaine Cassidy and Alexandra Roach.