What do you do when a frogman comes to down, settling into the kettle bog and threatening the local kittens and babies?
Why, bring in the witches of course. A coven of them — twelve now, not thirteen as they once had been — including Julian who has been isolated from the rest for the last six months and still in the grip of an active spell that prevents her from speaking. The problem is, the last time the coven had to deal with a frogman, they were twenty witches strong and still barely managed to defeat it; and the other problem is, Julian is an oratory witch, one whose power is strongest when she speaks.
The rest I’ll leave to the reader to find out for themself, but it involves a panoply of witches with different powers and abilities all picked out with humor hunting down the frogman, and an explanation of why Julian placed the silence-spell on herself in the first place.