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I noticed that this specific edition of Neverwhere by Neil Gaiman was missing its ISBN. When I got my hands on a physical copy of the book, the information provided was:

Copyright (c) 1996, 1997, 2000 Neil Gaiman
[...]
First published in Great Britain in this paperback edition in 2005 by REVIEW
An imprint of HEADLINE BOOK PUBLISHING

This edition published in 2013 by HEADLINE PUBLISHING GROUP
[...]
ISBN 978 0 7472 6668 6 (A format)
ISBN 978 0 7553 2280 0 (B format)

The issue is, the first ISBN leads to an edition with 372 pages; the second, 384 pages; and the edition I linked to has 400 pages and a different cover (also, published in 2013 and not 2005). The main problem is that this 2013 edition does not appear to have an ISBN of its own...? What should be done with it?

Sounds like it's a reprint, perhaps. When that happens, we put a note in the book description with its ISBN. In this case, I am not sure which ISBN should be added.

Any other librarian speak copyright-ese?

Follow-up: Someone else has already added an alternate-cover edition with the same cover here:

/book/show/1...

Ignoring the date/publisher, are these the same? I think so... in which case, the 2013 edition should probably be merged. We don't create separate editions for reprints that are otherwise identical to previous reprints (i.e., have the same cover and content).