Sam Hannah had been a flying ace in the RAF. Now he is flying ancient planes across the jungles of Brazil. Neil Mallory is also a flyer - he needed a job and Hannah needed a partner. Their adversaries were the vast jungles and the Huna Indians, but they also came to be set against each other.
This is a 'classic' Jack Higgins novel from 1971 that actually deserves the heading classic. It is set in an area and era that I have read very little about. Higgins blend of Boys Own adventure works really well in this novel as it feels much more realistic than many of his books. The characters of Mallory and Hannah are great as they become friends, but also rivals. With added complications coming in the form of a femme fatale and a missing nun, this book proves to be an adventure from beginning to end.