Detroit, 1927. The city hums with the rattle of assembly lines, the secret hush of speakeasies, and the soft clink of jewelry that may or may not be real. Into this hot, slightly rotten summer, Ruta Sepetys drops Marjorie Lennox, the youngest daughter of a windshield empire that built its fortune on the same glass concealing so many of the family’s worst habits. A Fortune of Sand by Ruta Sepetys is the bestselling historical novelist’s first book aimed squarely at adult readers, and it lands with the kind of confident swagger that suggests she has been holding this Detroit story in her chest for years. Longtime readers of Salt to the Sea, Between Shades of Gray, and The Fountains of Silence will find the familiar Sepetys habits here: meticulous archival research, a deep loyalty to underrepresented history, and an instinct for the lives that get lost in official records. What changes is the playground. Trade the wartime gloom of Europe for a town that genuinely believes its own gilded press clippings, and you have a …