Gavin Royle was a Human Assistant Curator of the British Museum in an Undefined Multiverse. He, archaeologist Professor Jack Lowson, and Lowson's niece, Liz Beck, dealt with the murderous Slime Beast when it rose from the sea swamp known as The Wash. Ornithologist Manton Haywood and local huntsman Mallard Glover were also involved.

Decades later, when he and Beck returned, they had to deal with a second one.

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