However, I'm not certain this is the full story. 1) There seem to have been, at some point, a release of the first volume (White Ladies) as "Monsters Beneath", with ISBN 9781782761198, 48 pages. 2) There seems to have been a collection release "Under: Collected Edition", 104 pages, maybe using the same ISBN? I think this is the one causing the confusion. I have no idea what cover it had. 3) There seems to have been a collected release "Under: Goliath", 104 pages, using ISBN 9781782761204.
Anyway, I spent an hour researching this one, and I'm going to go with the best evidence I got, and leave a librarian note in case someone comes up with better evidence.
However, I'm not certain this is the full story.
1) There seem to have been, at some point, a release of the first volume (White Ladies) as "Monsters Beneath", with ISBN 9781782761198, 48 pages.
2) There seems to have been a collection release "Under: Collected Edition", 104 pages, maybe using the same ISBN? I think this is the one causing the confusion. I have no idea what cover it had.
3) There seems to have been a collected release "Under: Goliath", 104 pages, using ISBN 9781782761204.
Anyway, I spent an hour researching this one, and I'm going to go with the best evidence I got, and leave a librarian note in case someone comes up with better evidence.