The Salisbury Poisonings

The Skripals and DS Bailey fight to survive, and Tracy and the emergency services try to locate the source of the nerve agent to prevent further casualties.

CID officer Nick Bailey's condition worsens as Tracy struggles to protect local residents against the numerous deposits of Novichok being found across the city.

Several months later, the city is starting to forget and heal - until a scavenged perfume bottle leads to tragic consequences for Dawn and Charlie.

Nick struggles to adjust to life post-Novichok. Tracy learns that the contamination radius may be even bigger than last time. The poisoning proves fatal for Dawn Sturgess.