Final answer:
Turning over the brown leather book in 'Endymion Spring' may trigger a significant turning-point for Blake involving a revelation or the discovery of knowledge. This could serve as the story's falling action, leading to a deeper understanding of the book, himself, or the greater narrative at hand.
Step-by-step explanation:
When Blake turns the brown leather book over at the end of the passage from Endymion Spring, it is likely that significant events will unfold. Inspired by the provided texts, which exhibit themes of change and revelation, one could speculate that Blake may discover a deeper secret or knowledge hidden within the book. Given the mysterious and anticipatory tone of the narrative, the act of turning the book over could symbolize Blake's readiness to face whatever is coming, setting into motion the story's falling action and working towards a resolution. By this action, Blake's character is showing growth and the potential to learn something transformative, whether that be about the book, himself, or the world around him.
The literary references contemplate the idea of a turning-point, critical moments leading to insightful conclusions or the dark underside of nature - a motif that can similarly be applied to the action of turning over the book in the story. It would not be out of place to assume that Blake's action could reveal a hidden message or power and this key moment could be a denouement, leading Blake to understand his connection to the book and its true purpose.