We are not aware of the publication but it would appear to be a sad story.
Captions written in pencil by the artist:
1. At last the struggling hind legs found a ledge of rock / page 70
2. He snatched at her tail and held it / page 137
3. A mysterious power drew Mufin’s legs up from the key / Page 198
4. They found her body a little way below the falls / Last Paragraph