Larry Niven

The Ringworld Throne is a novel by Larry Niven, first published in 1996. It is the direct sequel to his previous work The Ringworld Engineers. He wrote it as a replacement after being unable to finish his contracted novel The Ghost Ships, the sequel to The Integral Trees and The Smoke Ring.

The Smoke Ring is a 1987 science fiction novel by Larry Niven. Like much of Niven's work, the story is heavily influenced by the setting: a gas torus, a ring of air around a neutron star. It is a sequel to The Integral Trees.