Impact

Wyman Ford is called up for a secret expedition to Cambodia to locate the source of strangely beautiful gemstones that do not appear to be of this world. Meanwhile, a brilliant meteor lights up the Maine coast. Two young women borrow a boat and set out for a distant island anxious to find the impact crater. A scientist at the National Propulsion facility discovers an inexplicable source of gamma rays in the outer Solar System.
He is found decapitated and the data missing. High resolution NASA images reveal an unnatural feature hidden in the depths of the crater on Mars - and it appears to have been activated. Sixty hours and counting .