The human race has a strange future. Crazy technology, magic, and much more.
This is a unique book, and it has a predecessor. It is called Infinity. It is not written as well, but provides the background and origin to this book. However, Home can be read alone, independent of Infinity, and you may wish to start here. Let the book tell the rest of this story. This may also have traumtic content, but I'm not quite good enough at getting across that part of it, so leave it up to you.
(btw RG stands for railgun)