Sixteen-year-old Poppy Silk faces a perilous future after her father's death leaves her vulnerable within her impoverished navvy community. Orphaned and exposed to the predatory attentions of men seeking to claim her, Poppy's only solace is a burgeoning connection with Robert, a young engineer. However, Robert's affluent family has designs for his future that do not include a girl from the tracks, creating a significant obstacle to their potential romance. Poppy must navigate the harsh realities of her social standing and the expectations of others as she questions whether true love is worth the risk of abandoning her entire life.

The premise sets up a classic tale of social disparity and forbidden love, suggesting a narrative that will appeal to readers who enjoy heartwarming stories of overcoming adversity. The focus on a young protagonist navigating difficult circumstances points towards themes of resilience and self-discovery. The historical setting of railway construction in the 19th century likely provides a rich backdrop for the romantic and dramatic elements. The story appears designed to evoke empathy for Poppy's plight and a desire for her to find happiness.