Savanna : Operation Stargate, Book 2

Assuming the existence of a Star portal on the planet Savanna to be a secret, the humans don't know that the Accilla, the Spiders, and other spacefaring races are fully aware of it. Jeremy Sheppard, a newly appointed Captain of the Solar Space Force to the military outpost and Dennis Collins, a civilian, must join forces to thwart a conspiracy to control the Star portal.