executed in front of her home. their lives had been interconnected. but what about their deaths? random acts? or as some suspect, part of an international murder conspiracy. that stretches across two continents and several world capitals. we'll investigate who wanted them dead and why. the case will take us from moscow two rome, two london, into a world of spies and spy catchers. of corruption and those who dare to expose it. a world in which murder happens, often. was there a hit list in my? >> sure that there was. >> but our story begins closer to home. on a late, winter evening, paul