The original author of the magical field guide who hid it from the shapeshifting ogre Mulgarath. After being held captive by sylphs for eighty years, he reunites with the Grace children, helps them escape his captors, and eventually departs with his daughter Lucinda.
Biological father and daughter separated by decades of magical captivity.
Arthur created the guide to document fairies, while Mulgarath seeks its secrets for malicious purposes.
Arthur authored the Field Guide, while Thimbletack acted as its secret guardian, swapping fake pages to protect the original.
Helen becomes the accidental custodian of Arthur's legacy and magical artifacts after inheriting his estate.
Arthur facilitates the escape of Hogsqueal and the children, aligning their goals against the sylphs' imprisonment.
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