In “Celtic Moon,” a captivating blend of tradition and modernity unfolds as Sarah MacAlpin navigates a dangerous convergence of ancient prophecy and personal demons. As she delves into the mysterious Gaelic songs of her past, her academic pursuits and burgeoning romance with the enigmatic Dermot Sinclair are clouded by troubling near-accidents and suspicions of deceit. As she grapples with her own mental health, Sarah must unravel the secrets of her heritage before it’s too late.