Men Without a World — John Russell Fearn

Professor Grant Denham, the famous archaeologist, had sent a desperate radio call from the remotest part of Peru for help. He swore he had discovered something of enormous interest, but was lost and needed assistance immediately.

His daughter and two friends rushed from New York to try to find him. All had gone well until the guides deserted, stealing most of the equipment and leaving the three stranded. But still they pressed on...