Turnstone. The Greatest Cape, #4

Originally intended as a trilogy, the Greatest Cape series has now become a quartet of novels. Turnstone is a sequel to The Black Joke, The Bernadette and Rio Sagrado, and once again the little town by the sea is torn apart by sinister events. Pert and Rosella may be grown up and respectable now, while the mercurial Fenestra has retired to live with cannibals in the jungle, but other members of their families have taken up the torch.
The entertaining June and Bertie continue their career of mayhem, leading a strike at school, trying to invent manned flight (well, girled flight, to be strictly accurate) and generally interfering in things that don't concern them. Even their wit and quirky charm is not enough to keep them out of trouble, though, and things get worse before they get better. A LOT worse!... who is Etherial Faun, and is her pet really a hamster?...
are those charming girls at The Emporium really going to be made homeless?... can a small girl actually fly, and who will catch her when it all goes wrong?... what will it take to turn the awful Mrs. Wheable into an Auntie one can be proud of?... someone makes the town an offer it can hardly refuse, but sinister forces are at work ...... but mermaids, really? MERMAIDS? Oh, come on ...