Can you let us into the little secret of your longevity, please?

Only a few emperors had been let into the secret.

We'd better tell Guy and let him into the secret.

When you are away from home, and find yourself ignorant of a thing or two, never let others into the secret.

Everyone else seemed to have been let into the secret and they obviously approved.

You might let him into the secret, but no one else.

Are you going to let me into the secret now, or will I have to wait?

I haven't even let my own sons into the secret.

Of course I shall have to let a few people into the secret.

And how did you come to be let into the secret?