Amazon.com description: Product Description: Their America is gone forever
 
After the United States suffers a major socio-economic meltdown, a power vacuum sweeps the globe. A newly-radicalized Islamic government has risen in Indonesia and—after invading the Philippines, East Timor, and Papua New Guinea—sets its sights on Australia. No longer protected by American military interests, Australia must repel an invasion alone.

In the thick of it all, Peter and Rhiannon Jeffords, American Christian missionaries in the Philippines, and Chuck Nolan, a Texan petroleum engineer in Australia, find themselves adrift in a world in flux. Chronicling the Jeffords’ and Nolan’s fight against Indonesia’s merciless advances, Expatriates is a riveting thriller and a powerful depiction of the authentic skills and techniques needed to survive the collapse of modern civilization.