When a team of American archaeologists vanishes in the remote Yutucan jungles, FBI agents Mulder and Scully are dispatched to uncover the truth behind the disappearance. Mulder suspects that the lost city of Xitaclan holds secrets far beyond a simple missing persons case, particularly after discovering a mysterious jade artifact. Scully approaches the investigation with her characteristic scientific skepticism, attempting to ground the bizarre local legends in empirical reality. The narrative follows the duo as they navigate the dense, unforgiving environment while contending with both human threats and potentially ancient, unexplained phenomena.

This novel functions as a faithful expansion of the television series, capturing the established chemistry between the two lead characters. The narrative leans heavily into the pulp-adventure elements of the franchise, prioritizing the mystery of the jungle setting over complex character development. Readers familiar with the show will recognize the familiar beats of the investigative process and the recurring skepticism-versus-belief dynamic. The prose maintains a brisk pace that mirrors the episodic nature of the source material, providing a self-contained experience for fans of the genre.