Set on the eve of the First World War, the film follows a young boy who discovers a Queen of Spain fritillary, one of the rarest butterflies ever seen in the British Isles. His encounter reflects early 20th-century attitudes toward butterfly collecting. The story draws on the natural history of a species rarely recorded in Britain.
| Actor | Role |
|---|---|
| RRussell BinnsNarrator | Narrator |
 Natasha AldersladeFlora Harwood | Flora Harwood |
| HHarley Joel EmmittFreddie Harwood | Freddie Harwood |
| KKenny FullwoodLester Moffat | Lester Moffat |
 Karen LewisHarriet Fairchild | Harriet Fairchild |
 Jordan LongAlfred Jessop | Alfred Jessop |
| SSeth MacleodBertie Jessop | Bertie Jessop |
 Miles RichardsonHenry Harwood | Henry Harwood |
 Jacob SmithArchie Harwood | Archie Harwood |