City of Gold by Alex Lukeman

Cut off from government support, the Project has gone private as the Harker Group, specializing in high order security. Business has been slow, but when a wealthy British explorer wants to hire her services, Director Elizabeth Harker isn't sure she wants the job.
Sir Jeffrey Livingston has an ancient map leading to the lost city of Paititi, where a legendary treasure of gold was hidden during the Spanish conquest of the Inca Empire. The ruins of the city are somewhere deep in the unexplored Amazon jungle. Livingston is mounting an expedition to go after the gold. He wants the Project team to provide security.
Simple enough, except word of the map and expedition has leaked. Communist rebels want to get their hands on the gold and use it to fan the flames of revolution. That can't be allowed to happen. Harker agrees to take Livingston on as a client.
The team heads to Peru and sets off into the Amazon. Soon they are far from...

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