Who is Varvara Sokolova? It's a question Robert Smith's been asking himself ever since he met and fell in love with her in St Petersburg. After four years living together in England, his fiancee remains an enigma. Perhaps that's why they're still not married.

Varvara's family are into organised crime in a big way, which explains why they're prepared to muscle in on Robert's cryptocurrency account and hijack it for money-laundering purposes. When Robert reacts to this and pulls a fast one, they stand to lose tens of millions of pounds. He and Varvara are now in fear of their lives and are driven into hiding.

With the exchange rate plummeting, the Russians are forced into a desperate race to locate the funds and save their dwindling millions. As she's drawn inexorably towards a final reckoning, Varvara knows her family will stop at nothing to get their money back.

'Bring it on', she says to no one in particular.