Something to do with digging out secrets, finding hidden things.

"That's the kind of thing I like, the hidden things," she said.

Yet it was quite sure that both of them had touch with hidden things.

He didn't want hidden things between him and this man.

I liked having covert awareness of hidden things under his clothes.

A hidden thing meant to stay that way, and failing.

Pat would have liked to see all the hidden things in the house.

But no, it wasn't enough, the hidden thing would not be exposed.

Or because of some completely private hidden thing in Hill's memory?

No one searching for a hidden thing of power would have had reason to search them.