A young girl's plea to a fictional detective ignites a real-world investigation into her father's disappearance. When her father, a geological surveyor mapping a proposed subway route in Los Angeles, vanishes, his eight-year-old daughter takes a desperate measure: she writes a letter to Sherlock Holmes. This unusual appeal, intended for a literary hero, unexpectedly draws the attention of a real investigator who must navigate the complexities of the city's underbelly and the potential dangers lurking beneath the surface to uncover the truth behind the surveyor's vanishing act.

The premise of a child reaching out to Sherlock Holmes for help in a real-life mystery offers a unique blend of innocence and intrigue. The narrative likely explores the contrast between the child's perception of justice, informed by literature, and the gritty realities faced by those investigating the disappearance. The setting of Los Angeles, with its proposed subway system, suggests a backdrop of urban development and potential hidden secrets. This setup promises a story that is both a compelling mystery and a poignant exploration of a child's resilience in the face of adult complexities.