The Salisbury Poisonings is a BBC drama about how the city of Salisbury and its people found themselves at the centre of an international incident back in 2018.
Life in the city and in some surrounding areas ground to a halt after two Russians attempted to assassinate Sergei Skripal, another Russian, and his daughter Yulia in March.
The men used a "high purity" strain of Novichok – "newcomer" in Russian – a military-grade nerve agent that was developed by the Soviet Union during the '70s and '80s.
Sergei had begun working as a spy for Britain from the mid-1990s onwards, which for Russian president Vladimir Putin was the ultimate betrayal. He was arrested by the FSB (who replaced the KGB after the fall of the USSR) and became a UK citizen after being exchanged for Russian agents in a "spy swap" in 2010.
During a forum in Moscow in October 2018, the politician described him as a "scumbag" and a "traitor".
Watch: UK names third Russian in Skripal poisoning case
"He was simply a spy," said Putin, "A traitor to the motherland. There is such a concept – a traitor to the motherland. He was one of those."
Putin has always denied that the Kremlin was behind the events in Salisbury, but the British government believe that the two men were agents from Russia's military intelligence outfit, the Main Intelligence Directorate (GRU).
Anatoly Chepiga and Alexander Mishkin both worked for the GRU, the former a colonel and the latter a military doctor, and travelled to the UK under false names.
When later quizzed about why they visited Salisbury, they cited the cathedral as the main draw.
There was one death as a result of what happened, and it was neither Sergei nor Yulia.
Dawn Sturgess, a 44-year-old mother-of-three, died at the end of June after coming into contact with Novichok.
Four months after the attack, Dawn's boyfriend Charlie Rowley found a plastic container with what he thought was a bottle of perfume in a charity-shop bin. He gave it to Dawn as a gift, who sprayed the contents on her wrists. Her health quickly and severely deteriorated.
Charlie, who also fell ill and was taken to hospital, managed to survive, but is still dealing with the psychological and physical fallout.
It was reported in January 2019 that Sergei and Yulia were still believed to be living in southern England.
After they were discharged from hospital in Salisbury – Yulia left after a month, and her father followed her a month later – they were resettled in an MI6 safe house.
"There are lots of reasons why they would stay in Britain and it's notable that in his recent Panorama interview, Sir John Sawers, the former chief of the Secret Intelligence Service, when asked whether they were still in this country, said the UK authorities would continue to look after people in such a position," BBC journalist Mark Urban told The Telegraph.
According to sources, the pair were still in contact with close friends and even continued working for the British intelligence services. But they kept a low profile and reportedly changed their appearances.
The following photo of Yulia was taken during an interview with a journalist back in May 2018, but that is the last known public image of her, and there are none, understandably, of her father.
The Sunday Times Magazine has since reported that the Skripals have moved to New Zealand.
According to a senior government source, Sergei and his daughter have been given new identities and various other protections to help them start over.
The article also said that their former neighbours in Salisbury, Ross and Mo Cassidy, who feature in the dramatisation, received a Christmas card from the pair last year.
"It's nice to know they are thinking of us," said Ross. "But I don't expect we'll ever see them again."
The end of The Salisbury Poisonings confirms that.
Ross also told the Sunday Times that Sergei didn't use a different name when living in Salisbury.
"I'll never for the life of me understand why they didn’t give him a pseudonym," he said.
It's unsurprising, then, that the spy would keep a watchful eye over his street from the comfort of his armchair.
"Sergei saw you coming before you ever saw him," added Ross.
The Salisbury Poisonings is available to stream now on Netflix
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