His past is a closely kept secret.

"This is a closely kept secret," said one associate.

It was not unreasonable to suppose the secret had been closely kept.

The trip to Afghanistan, which had been in the works for several weeks, was a closely kept secret.

The existence of the taping system was a closely kept secret, which came out in the Senate Watergate hearings.

He had always kept closely to himself the location of Opar.

For designers, a good shade maker is a closely kept secret.

The Home Secretary and I were kept closely in the picture throughout.

Her own eye is kept closely on the very foundations of serious art.

The name of the Elene God is a closely kept secret in the Church.