Space tethers, Iranian scientists, Japanese tech wizards, NORAD, the CIA: Orbital Cloud has all this and more. Fujii gives us 500-plus pages of complex calculations, brilliant technological counterterrorism strategies, and a plot that accelerates with the speed of a space tether's terminal apparatus zooming off into space at 17.7 km/s. But (I hear you asking) would a person (such as myself) who shivers at the mere word "calculus" enjoy such a book? And my answer is absolutely. For this is one of Fujii's strengths: the ability to draw the reader in with a gripping tale of international intrigue and spies spying on other spies that is built upon a foundation of accurate orbital mechanics.…