They know where you are…

In the Mexican jungle a small scientific team prepares to embark on an exploration of the world’s deepest sinkhole; a naturally–formed underwater shaft that no one has ever reached the bottom of. What they are about to discover could change the world forever.

3,000 miles away, Joe McDonald’s father is arrested for murder and Joe is desperate to prove his innocence. Could the attacks in his town be linked to his dad’s research at the university? Could Dad’s colleague have brought something back from the expedition in Mexico? Suddenly the search for justice becomes a desperate fight for survival…