Note: The Green Queen is a verbatim reprint of Mistress of Virdis with the exception that the book publication has a prologue, an epilogue, and brief framing paragraphs at the beginning of each chapter.

Synopsis: From the first page of the Ace Double: "His atomic puppet was out of control! Bonnar had created the Green Queen thoughtlessly - all part of a day's work. But when his brain-child became a full-grown Frankenstein, a monster embodied in the girl he loved. Bonnar was terrified. For now she threatened to shatter the who carefully balanced social structure of Viridis - as well to undermine that radioactive world's atomic shield! Only Bonnar could end the holocaust and turn the all-to-grim reality back to the illusion he had originally intended. But to do that he had to destroy the girl he loved - or be destroyed by her."