Crossword Genius

Holy work that's unputdownable? (4,4)

Ross

I believe the answer is:

good book

I'm a little stuck... Click here to teach me more about this clue!

'that's unputdownable?' is the definition.
I can't tell whether this definition defines the answer.

'holy work' is the wordplay.
'holy' becomes 'good' (I can't justify this - if you can you should believe this answer much more).
'work' becomes 'book' (book is a kind of work).
'good'+'book'='GOOD BOOK'

Can you help me to learn more?

(Another definition for good book that I've seen is " Bible".)

I've seen this clue in The Sun.
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