Inquisitor 1633

[Ripper]

So near, yet so far!
I've found one books name (starting with c) are all the others by the same author (AC) or am I on the wrong track again? If someone could give me a clues about another books title that would help.
Also, although I've got the grid filled in apart from 13 across & 28 across, I'm missing some of the superfluous letters so I don't know what the 'something helpful' is
Basically I need help!
Didn't help that our garage roof blew off in the storm & now it's snowing!!!!!

[ProfessorMaisie]

Sorry about your garage roof, Ripper (we're sharing your snow).

Yes, all by AC (C,A,T,P is another one, a further 4 word title is a famous film).

The helpful message is to get you to look at the CLUES for another message (acrosses 9,12,13,14,16 + 19 are the superfluous letters you need to tell you where to look in the clues).

[Ripper]

Thank you ProfessorMaisie for you help. Finger's crossed I should be able to progress further!!!!!!

[ProfessorMaisie]

13a wordplay - '(pupil)S + 'learn' = CON [around] '(g)A[u]Z(e)' (with [u] being superfluous).
28a 'Rectify' = PURI(f)Y taking T(enor) for the removed '(f)ine'[r] (with [r] being superfluous).

[Ripper]

Thank you again!!