In "The Son of Neptune" by Rick Riordan, Reyna expresses her doubt to Percy as she inquires if he has a plan. Her lack of hope reflects the dire situation they find themselves in, illustrating the stakes involved. This moment signifies the weight of leadership and the need for a solid strategy in trying times. Percy feels the pressure to respond with confidence and bravery. He understands the importance of providing reassurance and hope to his companions, despite any uncertainty he might feel internally. This dynamic highlights the themes of leadership and courage in the face of adversity, as characters are often called to inspire others even when they doubt themselves.