Book excerpt: Blue Skies, Green Hell, a thriller written by a bush pilot’s wife, is a riveting tale set in the 1950s when pioneers of the sky flew single-engine aircraft over unforgiving wilderness and impenetrable jungle in Venezuela. Marilyn and Frank live in a place called the last frontier on the Orinoco River where he establishes a multi-aircraft service that flies supplies and medicine to remote and inaccessible communities. Together they challenge the odds and take the exhilaration of flying to new heights. Their world is fierce weather with no weather reports, aircraft with limited range radios, and planes with six basic instruments. A search and rescue effort ends when they make a forced landing in no man’s land. A flight to Miami turns sour as their twin-engine C-46 conks out over the Caribbean. Best friends die in fiery crashes. A stone age Indian appears where he shouldn’t be. This is drama from the cockpit of vintage aircraft.