Which method do the children use to communicate effectively?

The children in "The Mysterious Benedict Society" utilize secret codes and signals as their primary method of communication, which allows them to share crucial information without arousing suspicion from adults or their adversaries. This method is effective because it fosters a sense of teamwork and trust among the group, enabling them to coordinate their actions and strategies discreetly. The use of codes enhances their ability to convey messages quickly and efficiently, particularly in situations where they need to remain covert. Moreover, this approach aligns with the overall themes of cleverness and resourcefulness that are central to the story, showcasing the children's ingenuity in overcoming challenges they face throughout their adventures.