Indeed, I think it's the key to the whole mystery.

In his hands he held the key to the whole mystery of life.

Perhaps if I could remember them the whole mystery would be solved.

And that is the key to the whole mystery of my purpose on earth.

In a different interview Lucas said that the return would bring a whole new mystery to the character.

I think the basis of this whole mystery is nothing but business interest.

He was once one of the Rogues, whose reunion set off the whole mystery.

The colonel was the focal point of the whole mystery.

Obviously they were searching for something - and that was the whole mystery of their presence.

Could this be the solution of the whole mystery?