When a high-profile MP crosses the floor to join the British Way, a far right political party, MI5 must take extreme action to stop the group winning their first parliamentary seat.With racist attacksspiralling out of control, Adam goes undercover to destroy the organisation from within. But will he achieve his goal before his cover is blown and his life endangered?

When a legendary ex-MI5 officer unexpectedly kills himself, Harry is immediately suspicious. It soon emerges that the death was staged, but as the team go on a desperate hunt for the killers, the search turns out to lead dangerously close to home.