Rather a difficult secret to keep, wouldn't you say?

I was twenty-eight before she finally showed me the secrets of my own keep.

Because of this Anna keeps her crush on him a secret.

Even deep, dark secrets, the darkest of which I'm keeping right now.

I had, however, kept the best secret for last.

My secret would keep, perhaps be in less peril if I was gone.

Some secrets you couldn't keep, and that was one of them.

He hadn't kept his attraction to her a secret.

Oh, I doubt the secret will keep very long in local space.

Including, sometimes, secrets kept from those seemingly on your side.