This book review is about Marrow, the first book in the Great Ship cycle by Robert Reed. The story is set in a universe where humans found an abandoned spaceship and converted it into a train for public transportation. The story spans several thousand years and is about treachery, mischief, evolution, and religious sects. The book is compared to Ringworld by Larry Niven but is not considered better. The review is written by a sci-fi enthusiast who was intrigued by the author's popularity in China.