Families who loved Marco's Millions by William Sleator often look for books with a similar feel. These 20 recommendations were selected for their similarity in style, theme, and reading level.
Reach for this book when your middle-schooler expresses a restless desire for independence or feels like they are outgrowing their surroundings. It is an ideal pick for children who are fascinated by the concept of 'elsewhere' and find comfort in deep sibling bonds. The story follows twelve-year-old Marco, whose habit of wandering leads him through a portal into a strange dimension populated by insect-like creatures and a cosmic entity known as a naked singularity. Beyond the sci-fi thrills, the book explores the weight of responsibility and the cost of being a protector. It is a poignant look at a child who takes on adult-sized burdens to save his world, making it a great conversation starter about the balance between freedom and duty. While the concepts are high-concept and slightly surreal, the emotional core is grounded in Marco's devotion to his psychic sister, Lilly.