Well, without more context, it's hard to say precisely. But it might be about the stargate as a means of transportation between different galaxies or dimensions. Maybe it focuses on the characters who are brave enough to step through the stargate, not knowing what lies on the other side. It could include their personal growth as they face the unknown, their relationships with each other during these adventures, and how they adapt to the various environments they encounter through the stargate.
A 'Star Gate' novel could revolve around the concept of a portal, the stargate. It may tell the story of a group of characters who use this stargate to travel to different parts of the universe. They could be on a mission to discover new civilizations, technologies, or resources. There might be challenges like dealing with hostile aliens, understanding different cultures, and trying to keep the stargate technology from falling into the wrong hands. It could also involve elements of time travel or parallel universes if the story takes a more complex turn.