Visionary From The Stars (free)

For millenia, humans thought they were the only life in the galaxy-- until the day an alien species claiming to have humanity's best interests in mind forces its way onto an unsuspecting exploration craft. In another part of space, the Star Traveler's crew sets out on a camping trip to the surface of the moon. There, they stumble upon an object covered in alien writing revealing the first piece of a galactic map that will lead them into an intergalactic controversy--all while the Platonian race strives to sabotage their every move.