With her murdered husband’s powerful last statement still echoing in her ears, Marina Litvinenko has fought a long and lonely battle to bring two justice the two ‘businessmen’ thought to have poisoned her husband with radioactive Polonium-210  - former bodyguard Andrey Luguvoy and former KGB agent Dmitry Kovtun. Marina speaks to award-winning Daily Mail crime writer Stephen Wright on her long quest for justice, whether she fears she might be targeted by assassins, and why she still loves Russia.