It's one of the greatest conspiracy theories in all of modern music -- what if, at the height of their success, the world famous Beatles suddenly lost Paul McCartney? As the theory goes, Paul Prime actually died in a car accident in November of 1966. With millions of fans -- and dollars! -- on the line, the remaining Beatles and MI5 conspired to cover the whole thing up, replacing Paul Prime with a body double to avoid public chaos. Yet, as Ben, Noel and Max discover in part one of this bizarre, twisting tale, The Beatles may have harbored deep regrets... and began hiding clues to the truth in their music. Strap in, folks: this one goes deep.