The tomb of Alexander the Great has been found.

...but there's no one inside. Instead, what they find is far more terrifying.

And far more deadly.

An island prison complex is found off the coast of Turkey, and Reggie and Freddie want to find out just who might be held there.

Meanwhile, Professor Sarah Lindgren travels to Egypt to find her father, who mysteriously disappeared while on a dig with his students.

Through it all, there's one organization still hounding the CSO team, and they're more intent than ever to see their mission through.

Their mission? Kill the CSO team — every last one of them.

Join the CSO team in the latest nonstop action-adventure thriller of epic proportions!