In other ways he was the biggest mystery of all.

I don't want you to feel we're making a big mystery out of nothing.

"The big mystery here is: How could such a major work have disappeared so long ago?"

He's a big mystery, seems to have come out of nowhere.

She began to ask what the big mystery was, anyway, but thought better of it.

How about a little light on the big mystery, and the rush to the north?

The secret to quality public education has never been a big mystery.

But the biggest mystery has been the location of her body.

The nature of consciousness, to many people, is no big mystery.

Almost a decade after the family policy started, however, there was still a big mystery about it.