And keeping it secret from Americans is the easier part.

But your father told me that the element of the work was secret even from the government.

If so, how had they kept it secret from human beings?

It seemed that part was secret even from their own allies.

They would especially want to keep it secret from me, of all people.

Has any part of me ever been secret from you?

"We have to keep it secret from the beginning," she said.

Then he wouldn't have to keep it secret from her.

And the whole thing was secret, from start to finish.

They had both kept it secret from the other street people.