Rhialto the Marvellous takes up the personal and political conflicts among a conclave of two dozen magicians of Ascolais and Almery in the 21st Aeon. The shocking appearance of the Llorio the Murtha, a powerful female force from an earlier aeon threatens to unbalance nature by "ensqualming" or feminizing the magicians. This triggers a tremendous struggle for power and the other mages turn against Rhialto. Hoping to reestablish his rightful place, Rhialto travels to other aeons to restore the missing Perciplex which projects the Mostrament, the constitution of the association. In his final adventure, Rhialto must, ultimately, travel to the very ends of time and space to confront an old adversary whom he had wronged and must commit further misdeeds to restore order.