The revised edition is "pretty much" the same core plot and characters from the original edition. Dr. Spires' mysterious disappearance (and reappearance) as well as his and Nancy's conclusion about the illegitimate nursing home, are introduced and finished earlier, with less description (par for the course in the revised books and on). Effie is introduced earlier, and her ditzy personality is somewhat toned down. Bess and George (instead of Helen) help her sneak around the mysterious house.
However, there is a subplot that ties into the mystery; there are strange doin's at Helen's grandparents' house, including rings of mysterious blue fire starting up outside--sometimes coming toward people! It turns out that the Corning's housekeeper, Morgan, is in Adam Thorne's (the debarred lawyer) debt. Due to his criminal past, Morgan needed forged job recommendations. But because Adam Thorne starts to go too far commiting crimes, Morgan tries to go back to "the good side" (I keep thinking of Severus Snape abandoning Voldemort :-p) and his life is in danger. But of course, everything does tie up in the end.
- There are no more frilly frocks, "colored starters" or bumbling Irish police chiefs.
- Nancy gets a new convertible--no more roadsters
- Nancy, Bess and George stop at a restaurant before "Mission save the old ladies" (my phrase :D ), but there is no old fogy ranting about the Tookers' noisy airplane and the fact that they dare to not go to church or subscribe to the town newspaper.
- In the revised edition, Nancy is at the flower show when a big dog suddenly attacks her--Adam Thorne's doings, Carson Drew surmises. Poor Nancy can't even go to a flower show without risking life and limb.
Though I usually like the revised editions because they're a quick, "take-a-break" read, the original was better. The Morgan subplot was really useless in the revised edition, and the yacht club ball was described more colorfully in the original.
Above: Nancy as she appeared in the originals: a stylish dresser with a golden bob.