And no wonder he went to such lengths to conceal his secret.

Each contestant has to conceal a secret which the other contestants must try to discover.

At times, she seemed to step out of the action to project this gaze at the audience, half concealing secret smiles.

Here, it seems far-fetched that so many important people have successfully concealed secret pasts for a quarter of a century.

But for more than a decade that industry has concealed a secret.