Castle Storm

Castle Storm is the second novel in the Welkin Weasels series by Garry Kilworth. Picking up shortly after the end of "Thunder Oak", the novel centres on the anthropomorphised weasels searching for the humans that mysteriously vanished from their homeland many years before. Following a clue found in the first book, the weasels, led by the outlaw Sylver and pursued by the stoat Sheriff Falshed, journey to a far-away city where they find themselves entangled in a battle between rivalling clans of squirrels. Published in Germany under the title "Belagert die Sturmburg."
Synopsis.
After discovering the second clue to the whereabouts of the humans lies at the famed Castle Storm, the outlaw weasels journey to the south of Welkin, where the castle lies, to discover more about the mysterious human evacuation. However, a cascade of rats is swarming down from the marshes in the north of the island to seize power from Prince Poynt.
Plot.
In the unnamed marshes in the north of Welkin, the evil stoat lord Flaggatis plots to eradicate Prince Poynt's grip on power. He sends his evil rats to commence a massive war against the stoats. His main attack source is Castle Rayn, home of the stoats, but he also has other targets, too: County Elleswhere, home of Sylver's band, and County Fearsomeshire, home of Lord Ragnar. Prince Poynt and his stoats are overwhelmed, 'in their beds', as Flaggatis hopes, but not before a ferret messenger is sent to Lord Haukin, ruler of Halfmoon Wood.
In the wood, Sylver's band corner the ferret and eventually, when Sylver arrives, they listen to his story. Lord Flaggatis has built a massive wooden god-effigy, more like a monstrous white rat than anything else. After hearing the ferret's alarming tale, the weasels consider what to do and decide to support the stoats in their battle against the rats, as the rats are the enemies of all of Welkin and the weasels start to travel to Castle Rayn. They eventually reach it, although they have to contend with several cowardly stoat mercenaries upon the way, who have deserted the war out of fear of the rats, but eventually the cowardly stoat soldiers join the weasels to attack the rats. The weasels send Scirf and Mawk in to infiltrate the castle, and they eventually enter, but the weasels are captured by Prince Poynt in the process, who throws them in his dungeons. Mawk the doubter convinces their guard to play a game of hollyhockers with him, and appears to lose, but later he reveals that he held the guard's key to the weasels' cell in his mouth all along.
After slipping through a grating cover, the weasels worm their way down through the underground rivers and enter an otter colony, where they meet Sleek, an otter obsessed with fashion. Back at Castle Rayn, Prince Poynt appears cleverer than he looks, and tells Sheriff Falshed to follow the weasels and obstruct them in their quest. After allowing him to free them, the weasels then enter an open lake where they meet their old friend Sheriff Falshed, who has been knocked unconscious by the fall from the cliff. After contending with some rats and a giant dragonfly nymph, carnivorous in nature (carnivorous meaning "mammal"-eating, rather than insect eating) Sheriff Falshed fakes amnesia, and thus the weasels "finally" make their way to the castle, leaving Sleek the otter to go his own way (to find a fashion industry). Sheriff Falshed fakes amnesia throughout the entire voyage to Castle Storm, where the weasels meet a massive rivalry between the grey squirrels and the highly arrogant red squirrels. The red squirrels are led by Clive of Coldkettle, who sports an extra-large tail, and the grey squirrels are led by Pommf de Fritte. The weasels are accepted by the reds, and are shown around town by Clive, where Sylver encounters a coven of moles, who, much to Sylver's alarm, proclaim him to be Lord of Elleswhere.
The weasels are invited to a tournament, where, to their horror, their friend Icham is killed by Torca Marda. Icham dies despite an attempt to revive him by a good stoat doctor. After a feast that night, where the weasels meet two evil ferrets called Rosencrass and Guildenswine, who plot to kill Prince Poynt, and an extremely evil stoat called Torca Marda, who killed Sylver's father. The weasels then journey down beneath the castle to search for the clue, and narrowly avoid death when Torca Marda attempts to kill the weasels by resurrecting a badger, although they kill the fiend by stabbing it with a raptor's claw. Then the dragonfly from the lake breaks out of its aquatic nature and attacks the castle, devouring any creature in its path. The coven of moles, still intent on Sylver being a lord, suggest that they should feed the old and weak animals to the ravenous beast, and Torca Marda agrees on this mad plan.
Wodehed the magician comes up with a solution to the problem of the dragonfly: they must journey to the Forest of Lost Birds and retrieve a secret herb, known as "Shatter" from the goddess Sessile's garden. Sessile is a sentient tree, and in her roots another dimension resides. On their way to the forest, they run into, and escape, a group of birds who are obsessed with the idea of returning home to their island via a ship of Braeburns, and then are attacked by Rosencrass and Guildenswine, who, upon revealing that they have murdered one of the birds, are imprisoned in the trees of the Forest of Lost Birds. The weasels retrieve the herb, return to Castle Storm, and destroy the dragonfly, whereupon it shatters into small, harmless dragonflies. Torca Marda, furious at this loss of chaos, attempts to kill Sylver, but is scared off by Scirf, pretending to be an animal dying from the mange, and falls over a cliff to his death. His priests, attempting to shatter the squirrels into pieces with the herb, are themselves turned into minuscule stoats by the same herb and Welkin is free of the evil of Torca Marda. The next day Lord Ragnar is killed in battle with the rats, and Prince Poynt promises to elect Sylver to a lord if he defeats the rats, thus fulfilling the mole coven's prophecy. Lord Haukin tells Sylver and the weasels to partially knock down the sea walls, allowing a bore to flood to Castle Rayn and destroy the rat hordes, along with the effigy, although Lord Flaggatis escapes, along with most of the rats.
The otter Sleek comes to Castle Rayn to make a fashion industry with the stoat princess, Prince Poynt's sister, (who secretly fancies Falshed) and the prince is left to his misery, thinking gloomily about his murdered brother, King Redfur (Poynt refuses to be king as all the previous stoat kings were murdered) who often enters his mind when he is feeling depressed. The novel ends with Poynt overlooking a massive inland saltlake which now spreads around his castle, whereas in the rest of Welkin the sea begins to cascade down into the land.