Sam DuChamp, mediocre writer of spy thrillers, creates Quichotte, a courtly, addled salesman obsessed with television who falls in impossible love with a TV star. Together with his (imaginary) son, Sancho, Quichotte sets off on a picaresque quest across America to prove worthy of her hand, gallantly braving the tragicomic perils of an age where “Anything-Can-Happen.” Meanwhile, his creator, in a midlife crisis, has equally urgent challenges of his own.