Ruins (X Files): Kevin J. Anderson

An American archeologist, Cassandra Rubicon, disappears while exploring the lost Mayan city of Xitaclan. X-File agents Fox Mulder and Dan Scully are sent to investigate. A mysterious jade artifact recovered from the ruins...ominous legends whispered by the natives...Mulder decides there's more to the case than a team of missing scientists - namely, ancient curses, blood sacrifices and deadly reptilian monsters lost in the jungles before history. But what the agents don't know is that Xitaclan is the scene of a three-way war between Central American drug lords, international smugglers of Mayan artifacts and a covert U.S. military team that has been sent to investigate and destroy a strange electronic signal received from beneath the ruins - a signal aimed upwards at the stars.