Okay, so my editor was right.
Thanks, though, Lolly, for taking the time to bolster my confidence, which was in the mud.
The problem with the first draft was that the story lacked tenderness. I thought it was because there aren't any kids in the book or something, but my editor told me to keep the plot and change Gus & Lucy's relationship from the beginning. They shouldn't start by sniping at each other but with tenderness (on Gus's part) and attraction on Lucy's part, and, by George, the revisions are flying now!
I'd better get back to them. The second draft is due just after Christmas!