The Mayan Conspiracy by Graham Brown 

Former CIA-agent Hawker has been black flagged by his own government and Interpol and the State department have issued a warrant for his arrest. All Hawker wants to do is find a way back home that doesn’t involve a prison sentence or a body bag. Government operative Danielle Laidlaw is his way out. She needs a pilot and a security consultant for her mission to discover the lost Mayan city of Tulan Zuyu. In return for his services, she promises Hawker his life back… Read more.