A cover letter is an accompanying letter that serves as
the introduction to your resume. No resume should be
sent without one. The cover letter is individualized for
each position for which you are applying. It is an
extension of your resume and reflects your knowledge
of the employer’s needs.
A - Not a knocker but Marley's face
This shows that the knocker transformed to the supernatural by becoming not what it was - but the face of his dead co-worker.
It clarifies the first part should be you answer here. i say this because one needs to clarify what is trying to be said.