How does a 200-ton passenger plane - carrying 227 passengers and 12 crew - vanish into thin air mid-flight? And how is it possible that even after six years, neither the plane nor the people on board have ever been found? This is the story of Malaysia Airlines Flight 370, which took off from Kuala Lumpur on March 8, 2014, headed for Beijing, but never arrived there... or anywhere. So what happened? Where did it go? And how?