When an uncharted cenote is discovered in lowland Yucatan, world-renowned museographer Robert Garvin and expedition manager Harold Ross hire a team of specialists to mine the cenote for original Maya art and artifacts.

Carrying along experimental technology, postgraduate students Ann Kaplan and Neal Child join forces with controversial archaeologist Mike Trenton in the decipherment of a mysterious inscription.

Overnight, as the up-and-coming enterprise faces major logistical issues and an obscure entity slays the expedition members, Professor Trenton and Kaplan turn to the inscription for clues.