Well, I'm not sure which specific 'titan science fiction book' you mean. But generally, science fiction books about Titans often explore themes like gigantic beings, their impact on a world or universe, and the technology or magic associated with them.
If the 'titan science fiction book' is about a Titan in the sense of a huge, powerful entity, it might delve into the power dynamics. For example, how the presence of such a being changes the political and social structures in the story's setting. It could also look at the origin of the Titan, whether it's a product of some advanced science experiment gone wrong or an ancient, otherworldly creature. And the characters in the book would likely be grappling with how to co - exist with or defeat this Titan, which can lead to some really exciting plot twists.
Some 'titan science fiction books' might also focus on the Titan's connection to the environment. Maybe it's a Titan that has a symbiotic relationship with a planet, or perhaps it's slowly destroying it. This could lead to stories about environmental conservation in a science - fictional context, with the characters trying to find a way to save their world from the Titan's influence.