Here's one for Robert Harris's next plotline: David Cameron has claimed that the KGB sought to sign him up as a double agent.
Double agent: David Cameron (with Russian President Dmitry Medvedev).
Regaling students at Moscow State University this morning, the Prime Minister recalled his first visit to Russia as a student on his gap year between school and university in 1985.
'I took the Trans-Siberian Railway from Nakhodka to Moscow and went on to the Black Sea coast,' he said.
'There two Russians - speaking perfect English - turned up on a beach mostly used by foreigners.
'They took me out to lunch and dinner and asked me about life in England and what I thought about politics.
'When I got back I told my tutor at university and he asked me whether it was an interview.
'If it was, it seems I didn’t get the job.'
Quite how the KGB gags, if that's what they were, will go down with Mr Cameron's already prickly hosts remains to be seen.
Over breakfast (served with large quantities of alcohol, perhaps explaining Russian male life expectancy of 59), the PM and his policy advisers discussed how to approach the first visit by a British leader to Russia for six years.
The Prime Minister will not have been pleased by the headline on page one of this morning's Moscow Times: 'Kremlin Sees No "Reset" in UK Visit'.
The message from Sergei Prikhodko, Russian president Dmitry Medvedev's chief foreign policy adviser, could not have been clearer.
Now and then: The Prime Minister on his visit to Moscow, left, and in an undated photograph, right, as he may have looked in 1985.
'No-one is expecting any breakthroughs, and in fact they are not needed,' he declares. 'Why fight? It is not necessary for us to have a "reset" with Britain. We will continue to work the way that we have been working in the past.'
Which, if he means what he says, means not terribly well, if at all. Officials admit Britain has had no formal contact at all with Russian strongman Vladimir Putin since 2007, when he made a cursory phone call to Downing Street to mark Gordon Brown's arrival as Prime Minister.
Mr Cameron acknowledges he is walking a tightrope on the visit, which, in what is becoming a trademark for his foreign visits, comes with a planeload of business leaders anxious to sign contracts in tow.
The PM does intend to make at least a passing public reference to the murder of Alexander Litvinenko in London - the only hostile nuclear incident ever to take place on British soil - which plunged Anglo-Russian relations to their lowest point since the end of the Cold War.
Poisoned: Alexander Litvinenko died in 2006, but Russia has steadfastly refused to extradite the prime suspect in the case, Andrei Lugovoy.
Russian dissident Litvinenko was poisoned with radioactive polonium-210 in London five years ago in what is alleged to have been a state-sponsored assassination.
But demands to extradite Andrei Lugovoy, the former KGB officer who is the chief suspect in the murder, will fall on deaf ears. Lugovoy, now a member of Russia's parliament, also had a message for Mr Cameron this morning.
'It's impossible to say who left the polonium,' he boasted from the comfort of a fishing trip in the Kamchatka peninsula in Russia's Far East.
But Mr Lugovoy does have a theory, which he is anxious to share. Litvinenko, he suggests, was involved in the trade of polonium and was killed not by the Russian secret service... but by MI6.
Back to Robert Harris!