Plot summary
As the novel opens, Mendoza is walking through incessant rain in the hills above old Los Angeles. It is winter, 1862, and to the east America is at war with itself. For over 150 years she has lived wild in the Pacific coast forest, collecting and cataloging plant species, and rarely interacting with anybody else, human or cyborg. This suits her fine, and she resents being commanded down to Cahuenga Pass for a special mission. As usual, however, she wants to be a "good little machine". She already knows what the mission is. The rain will be followed by a long drought, and there will be much to be preserved, which would otherwise be lost. What the drought cannot eradicate, starving cattle will. Meanwhile, smallpox will reduce the local population, especially the Native Americans.
Arriving at the Inn at the pass, she quickly meets her fellow cyborgs, the Facilitator Porfirio, Anthropologist Oscar, Zoologist Einar, Ornithologist Juan Bautista, and the Anthropologist Imarte, with whom she renews her ongoing feud. With all the traffic passing by, the Inn is a perfect cover for Company research and other work. However, when Mendoza arrives, the main problem is lighting a fire to cook dinner, given that everything is soaked by the rain.
Mendoza's first night is a rough one, as she dreams incessantly of Nicholas Harpole, her lover in 16th century England, who was burned at the stake. She is woken by Porfirio, who tells her she has been blasting the place with "Crome radiation", the blue radiance of psychic activity. She dismisses his concerns, but worries about this sudden resurgence of her previous troubles.
Later, she is led into the hills by Einar, to collect samples in the "Temperate Belt" which will be severely affected by the drought. This just happens to follow the future path of Sunset Boulevard. Along the way, Einar has to kill one of the locals. The hills are infested with bandits, crazy pioneers and other mortals likely to shoot first and warn later. Mendoza is shocked - cyborgs are programmed to run from danger and not harm mortals. Einar informs her that the rules are different here. She is even given a Navy pistol to use if necessary.
The Inn's inhabitants pass the time with movies supplied by the company. In one chapter, we get a long and reverent description of them watching D.W. Griffith's Intolerance , with Einar as Chorus describing every scene. Since Imarte was actually alive in Babylon, one of the movie's famous settings, we hear much about what life was really like.
Everything is thrown into tumult, however, when Mendoza decides to forage in Laurel Canyon. The place is known to be saturated with Crome radiation from a bizarre underground quartz formation. It is this which will attract so many unusual people to the site in the 20th century, and give rise to many of the underground stories of Hollywood. Despite precautions and a lot of very futuristic equipment, Mendoza and Einar suddenly find themselves thrown forward in time to 1996. Mendoza the botanist is suddenly in urban LA, where the soil is concrete and the major life form is the automobile.
Staggering up to a Company safe house whose future location they know, they are hastily taken inside by the staff, who have been expecting this event. Horses and all, they are placed in a Time Transfer chamber for return to their own time, but at the last minute Mendoza sees the cyborg Lewis enter the building. Lewis had befriended Mendoza at the facility New World One and she suspected he was in love with her. Lewis makes an attempt to talk to Mendoza, and tries to warn her "Don't go with him!". She has no idea what he means, and in any case, the transfer takes place before any more can be said.
Returning to the Inn, short one horse which died from the Transfer, Mendoza confronts Porfirio. He must have known what was going to happen to her. He grudgingly admits he knew something, but was just told to let it happen. He also knew only what he needed to know, and nothing more.
The drought starts to bite, and Mendoza is going further and further around the bend. Her lover haunts her dreams every night, and the resulting Crome's radiation provides nocturnal fireworks for her colleagues. She can no longer do any real work. Then one of Imarte's clients leaves behind a briefcase with amazing documents in it. They seem to relate to a British plot to exploit the disarray in the United States and take over the Channel Islands, specifically Santa Catalina. From there, a few well-armed ships could control the seas of Western North America. Imarte records all the papers and heads for San Francisco to do more research. All the others are called away also, except for Mendoza and Juan Bautista, who has finally allowed his pets to be shipped out with all the other biological samples.
At this point, Mendoza is astonished by the arrival of her ex-lover, Nicholas Harpole, except that he does not recognize her and goes by the name of Edward Alton Bell-Fairfax, an Englishman with mysterious intentions. Mistaking her for Imarte's assistant, he requests the usual service. Mendoza eagerly complies.
Soon Edward reveals he has come for the briefcase. However he is also intrigued by Mendoza, who shows sexual sophistication despite being virgo intacta - apparently the healing capability of the cyborg physiology has gone to extremes in her. She is able to persuade him to take her away, as she will enable him to avoid U.S. agents hot on his trail as he goes to meet his fellow conspirators.
Once more Mendoza embarks on an idyll, as they trek to San Pedro, and then to Santa Catalina, where a mysterious sailing ship awaits. Edward starts to show unexpected abilities, especially in being aware of things that humans usually cannot perceive. But then the ship turns out to be a trap, set by the Pinkertons. Edward is killed while disposing of the incriminating documents, and Mendoza finally snaps. She goes into overdrive, killing all the agents. When the British finally show up, she throws assorted body parts at them, whereupon they flee.
In the rest of the story Mendoza, having completed her confession, awaits her punishment. In the meantime, she examines her considerable store of information about the history of old LA, noticing for the first time how Santa Catalina has some kind of significance in the activities of the company. Apparently something on the island is vital to the actual creation of the company, but what?
Before she can pursue this further, she is put in a Time Transfer box and sent Back Way Back, or in more usual terms, to about 150,000 BCE. She is left on Santa Catalina itself, still forested rather than the barren island of later millennia. Her job is to raise food for a Company resort on Santa Cruz Island, where rich folks come back to hobnob with mastodons and hunt saber-tooths, or maybe vice versa. Her memory has been interfered with, so she can no longer remember details of the history she once knew. She also has a mission to alert the Company when certain unusual beings show up to colonize the center of the island. Apparently they have something the Company needs....
Mendoza seems hopelessly trapped. Can she survive to the 19th century all over again, or is her immortality as suspect as other things have become? Twice now she has met her demon lover. She knows he will come for her again.
