closed book

Given founding members of the competition could not be 'relegated' from it, critics argued the tournament was a closed book for Europe's elite teams.

Mr Ba may have been on the political scene for the last decade, but he is a bit of a closed book for most.

“As you know, I’m not normally a closed book on this stuff,” Sean told me.

When the bank collapsed, her loan was one of thousands sold by the government to so-called "closed book" lenders.

The answer was always there, tucked away within the brittle pages of that closed book—Papá.