Robert A Heinlein - Friday

From the inside cover of the hardback:

Friday is her name...She is as thoroughly resourceful as she is strikingly beautiful. She is one of the best interplanetary agents in the business. And she is an Artificial Person...the ultimate glory of genetic engineering.....
Friday is a secret courier. She is employed by a man known to her only as "Boss." Operating from and over a near future Earth, in which North America has become Balkanized into dozens of independent states, where culture has become bizarrely vulgarized and chaos is the happy norm, she finds herself on shuttlecock assignment at Boss's seemingly whimsical behest. From New Zealand to Canada, from one to another of the new states of America's disunion, she keeps her balance nimbly with quick, expeditious solutions to one calamity and scrape after another. Desperate for human identity and relationships, she is never sure whether she is one step ahead of, or one step behind, the ultimate fate of the human race.