The dialogue suggests a commitment to following rules or guidelines, even in the absence of a definitive manual. The characters acknowledge a collective understanding of the principles they abide by, pointing to an implicit code of conduct that they respect. This kind of strict adherence implies that they navigate their circumstances with both reliability and flexibility.

Miss Rook demonstrates an insightful awareness of this concept, as she grasps the underlying complexities in their commitment to an unwritten 'book.' The exchange highlights the importance of interpretation and the nuance involved in following guidelines that are not explicitly outlined, emphasizing the characters' ability to think critically while adhering to their principles.