Death in High Places — Ramsay Thorne

Through the sweltering, equatorial days, Captain Gringo marches across the highlands with his guard up and his Maxim handy. There's no territory he can call home, although there's a room reserved for him in every jail across the map and women who would gladly put him up as well.
He's leading a brigade through a maze of volcanoes, where molten lava fills the trail, and the burning sting of the common fly sets the pace. Colombia is a political powder keg, and he's bound for Bogotá to light the fuse that will ignite an explosion of chaos, destroying the country's corrupt and depraved regime.