'Command' is a novel by William McFee that introduces a new type of upper-middle-class English girl through the character of Ada Rivers. These girls differ from the traditional Lady Rowena archetype, as they are more independent and worldly, showcasing a mix of sophistication and romanticism. Although they possess various skills, they lack genuine life experience, leading them to make mistakes in their choice of partners and idealizing men who are not worthy of them. The book explores the complexities of relationships and the challenges of balancing independence and romanticism.