They thought they had found a safe haven in the green hills of England. They were wrong. One by one, the Russian oligarchs, dissidents, and gangsters who fled to Britain after Vladimir Putin came to power dropped dead in strange or suspicious circumstances. One by one, their British lawyers and fixers met similarly grisly ends. Yet, one by one, the British authorities shut down every investigation — and carried on courting the Kremlin.The spies in the riverside headquarters of MI6 looked on with horror as the scope of the Kremlins global killing campaign became all too clear.