closed book, a

A secret, mystery, or puzzle, as in I can't figure her out; she's a closed book to me. This term alludes to information one can't obtain or comprehend (because the book is closed). [Early 1900s]

Common Names:

Name	Pronounced	Usage
Ervin	['ə:vin]
Mesud	-	Ottoman Turkish
Suresh	-	Indian, Hindi, Marathi, Tamil, Telugu, Malayalam, Kannada, Nepali
LÉOnce	-	French
Alasdair	-	Scottish
Janelle	jə-NEL	English