Carlie McKinny accepts a last-minute job as a fill-in nanny, only to find herself unexpectedly thrust into the high-stakes world of professional baseball and a complicated history with the team's coach. Knox Miller, the coach, is immediately drawn to Carlie, but she's hesitant to engage, remembering their past relationship. Their history together, though not explicitly detailed, forms the central obstacle, as neither is ready to revisit the past or face the potential complications, referred to as a 'curve ball,' that their rekindled connection might bring.

The premise of Sliding into Homebase suggests a lighthearted and engaging romance novel, typical of the 'Spotlight of Spice' series. The focus on a single dad and a second-chance romance indicates a narrative that will explore themes of reconciliation and new beginnings within a contemporary setting. The description promises a fast-paced and spicy read, appealing to readers who enjoy contemporary romance with a sports element. The novella format implies a concentrated plot with a clear romantic arc, likely leading to a satisfying resolution for the main characters.