Echoing Time is part of a chronology of stories initiated by the miscreant Trillem Pax Kenroo and his search for universal intergalactic domination. However, he is thwarted early on by providence and the stalwart nature of a young Arapaho girl named Marin Wanderhorse. Marin is kidnapped by the ghostly spectre of Kenroo, whose mission was to gain corporeal form and rule the earth. Marin successfully hinders his efforts throughout history, returning his abominations to the normal flow of history as written. Eventually, Marin is successful in returning Kenroo toward his destined path of redemption, but she is lost in the paradox of quantum string and multidimensional travel. Her parents don't give up on finding her and, with the help a discredited quantum physicist and a hippie commune in the Sonora region of Arizona, discover and capture a quantum string. Eventually, they are able to use the string to travel between realities, stopping an international arms deal, returning lost art taken by the Nazis to Jewish families, and returning the antagonist, Kenroo, to his prescribed destiny.