"With a priceless emerald from an Inca temple in her possession, Leila Van Daren was rescued from the hands of a gang of masked raiders by Colonel Callaghan and his friend Hastings.
But the crooks, well-versed in all the arts of terrorism, were not so easily to be deterred, and in a second daring attack they kidnapped Leila in spite of her armed escort.
Callaghan and Hastings seemed helplessly trapped, but tight corners and desperate odds were the breath of life to Callaghan."