The change in the name of the party was a closely guarded secret.

Their marriage was a closely guarded secret for four years.

During the war their work remained a closely guarded secret.

For years, the site was one of the nation's most closely guarded secrets.

The details of the American plans are a closely guarded secret.

The identity of the committee members, however, is a closely guarded secret.

Most of their operations were kept a closely guarded secret.

It was good to have someone to share his most closely guarded secrets with.

The amount of her contract is a closely guarded secret.

The institute's work is a closely guarded secret in Israel.

The operation had been one of their most closely guarded secrets.

These figures were closely guarded secrets until the court case.

The creation of it was a closely guarded secret and has now been lost.

"Do you want to know my most closely guarded secret?

Whatever they intended for him, it was still a closely guarded secret kept among themselves.

To this day, the unique process they developed is a closely guarded secret.

They left here with some of the enemy's most closely guarded secrets.

"They're getting some of our most closely guarded secrets," he said.

This will have to become one of the bureau's most closely guarded secrets.

There are about 930 members spread throughout the world, and the list is a closely guarded secret.

It was thought best to keep the entire affair a very closely guarded secret.

As you very well know, this is a closely guarded secret."

The visit to Afghanistan was a closely guarded secret for security reasons.

"I'm about to tell you one of our most closely guarded secrets.

I have kept that sordid fact a closely guarded secret!

"This was once a closely-guarded secret among my people, but there is a time when secrets need to be revealed.

Her income from investments is a closely-guarded secret.

From that moment on, everything that happened to Pamella for the next month or so is a closely-guarded secret.

Manchester United striker says return of midfielder was a closely-guarded secret.

Decisions on interest rate movements and other market interventions by the monetary authorities are the most closely-guarded secrets in the financial markets.

For many French voters, support for the National Front is still a closely-guarded secret.

'Evan has revealed her closely-guarded secret to you, and has thus put all of us in a kind of jeopardy.

The exact nature of the toxin used to attack Mr. Meshal, who now appears fully recovered, is a closely-guarded secret here and in Israel.

Details of Diana's Royal wedding dress were kept a closely-guarded secret, until she stepped out of the carriage at St Paul's.

GKR claim to have developed a uniquely effective research procedure, but it is such a closely-guarded secret that its uniqueness and efficacy is impossible to judge.

Liverpool kept the operation a closely-guarded secret but the 30-year-old Whelan, who had sore muscle tissue removed from his right thigh, was released from a Merseyside hospital yesterday.

Her first public comments since the Tucson massacre, delivered in response to questions from US television royalty Diane Sawyer, remain a closely-guarded secret ahead of broadcast later this month.

Apparently there are hundreds of expert groups who work on the official papers published by the Commission, however the identity of the members of these advisory bodies that meet behind closed doors remains a closely-guarded secret.

During TLC's first national tour, as MC Hammer's opening act, Lopes and Thomas discovered that Watkins had sickle-cell disease, an ailment which she kept a closely-guarded secret until she became ill while TLC was touring the Southwestern United States.