Sabre and the Temple of the Sun

The Temple of the Sun Paul Sabre and his lover Shelly Newmar while on an expedition into the Andes Mountains to search for a lost city suddenly find themselves attacked by the mysterious Hawkmen of Hiratu and then find themselves captive atop the highest peak in the andes. Can they escape the birdmen or will they meet their fate atop the highest peak in the south American mountain chain...?