Author of the 17-volume book Down the River Light. In the 23rd century, Audrid Dax (the fourth host of the Dax symbiont) read the entirety of Caster's work to her daughter, Neema, as she lay in the hospital for two weeks with Rugalan Fever, even though the six-year-old was unconscious. But Audrid felt so helpless, she needed to do something to feel assured that she and her daughter were still connected. Later she realized that reading the book was as much for herself as for Neema.