Crescent Moon Rising tells the story of a post-apocalyptic world where World War III has reshaped geopolitics, featuring the clandestine AGENCY and its operatives. The narrative follows Percival Barr, a seasoned commander haunted by the disappearance of his family, and Gavin Newsome, a brilliant but socially awkward tech prodigy, as they navigate dangerous missions against Russian and Iranian forces. The story highlights themes of survival, personal loss, and the moral ambiguities of warfare, culminating in a critical mission to Iran and the unfolding mystery of the "Mahdi." Interspersed are subplots exploring characters' backgrounds, relationships-like Gavin and Jessica's burgeoning romance-and the wider societal impact of the conflict, setting the stage for future installments.