What happens if you do actually find the pot of gold at the end of a rainbow?

Nicky has always known Russell was rich, but he has no idea how astronomically rich Russell is until his friend drops dead, on his fiftieth birthday, with Nicky as the only witness. And now Nicky has come up with an uncharacteristically daring plan. If Nicky were to become Russell and leave his old life lying dead on the bathroom floor, he and his family could start again.

But when the foundations of their glittering existence start to crack, the impact of his hasty decision begins to be felt by those around him: by Nicky's distant father; by his daughter's babysitter and her boyfriend, who harbour grand hopes of their own; by a young Englishwoman attempting to find her father; and by Catherine, an ex-soldier with a suspicious interest in Nicky's movements.