This is book three of a series of five books.
Louis Wu is old. He could be young again if he allowed the Hindmost to rejuvenate him. But he will not. As punishment for his involvement in the scorching of part of the Ringworld’s surface to correct it’s orbit. The plan ultimately saved Ringworld from complete destruction, but at the cost of billions of lives.
But the Hindmost needs Louis’s help. There is strong evidence that Protectors are alive and active in Ringworld. Ships are being incinerated as they approach Ringworld. Vampires are assembling on mass. War seems inevitable.
Meanwhile the machine woman Valavirgillin is leading her own war against a huge nest of Vampires that has been plaguing the area. All these events are due to a struggle for power. A struggle for the Ringworld Throne.