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4 March 2018. Emergency services descend on Salisbury’s city centre where they find Sergei and Yulia Skripal unconscious on a park bench.

Continuing to fight for the resources necessary to contain the contamination, and realising the scale of the task ahead, Tracy needs to move out of her family home and into her office, to the dismay of her husband and son.

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