Here Be Monsters! An Adventure Involving Magic, Trolls, and Other Creatures; The Ratbridge Chronicles Volume 1 Chapter 43

Deep Water

• Back at Grandfather's place, they don't know if Arthur actually got the keys or not. But they do know it's time to vacate, since the water levels are rising.
• So they set out, and wade through a bunch of water… only to end up in one of Snatcher's traps.
• This time, though, Snatcher's minions aren't fooled, and they identify William (Grandfather). Everyone gets stuck in sacks and brought up to the Cheese Hall.