Back Up Point blank

Berlin, 1967: four members of the British rock band Pearl Harbor die at the same time but in separate locations. Inexplicably, the police conclude natural causes are to blame. Brussels, 2010: A homeless man is hit by a car outside the Gare du Midi, leaving him with locked-in syndrome, able to communicate (sometimes) by blinking. An Irish journalist's interest is piqued. How did the members of Pearl Harbor die, and how is this linked to the homeless man in Brussels?