You don't know me, but I thought I knew you . . .

A man waits at a London airport for Ingrid Ostermann, the love of his life, to arrive. Across the Atlantic, a retired NYPD cop waits in a bar in Florida's Key West for his first date with the lady who is, without question, his soulmate. The two men are about to discover they've been scammed out of almost every penny they have in the world - and that neither women exist.

Meanwhile, a wealthy divorcee plunges, in suspicious circumstances, from an apartment block in Munich. In the same week, Detective Superintendent Roy Grace is called to investigate the suicide of a woman in Brighton, that is clearly not what it seems. As his investigations continue, a handsome Brighton motivational speaker comes forward. He's discovered his identity is being used to scam eleven different women, online. The first he knew of it was a phone call from one of them, out of the blue, saying, `You don't know me, but I thought I knew you'.

That woman is now dead.

Roy Grace realizes he is looking at the tip of an iceberg. A global empire built on clever, cruel internet scams and the murder of anyone who threatens to expose them.