The planet is administratively divided into city-states founded around procreation centres named Wells that were originally introduced by the Day-Keepers as a solution to Silistra's infertility problem.

In The High Couch of Silistra, Estri, Well-Keepress of Astria and holder of the ultimate seat of control begins an epic adventure to discover her origins and save the dwindling population.

Charles N. Brown of Locus, is quoted on the Baen Books reissues of the series as saying, "Engrossing characters in a marvelous adventure".

[citation needed] Frederik Pohl is quoted there as saying "The amazing and erotic adventures of the most beautiful courtesan in tomorrow's universe.

"[2] Stephen Andrews' 100 Must-Read Fantasy Novels recommends High Couch of Silistra to readers who have enjoyed Jane Gaskell's The Serpent.