Salvage is the final part of Tom Stoppard's trilogy The Coast of Utopia. It is 1852. Alexander Herzen, who left Russia five years earlier, has arrived in London in retreat from a series of public and private calamities. Revolution in Europe has hit the rocks. 'I have lost every illusion dear to me,' he says. 'I'm forty. The world will hear no more of me.' But émigré circles in London (including Ka...