The protagonist of the novel is 'David Bell', who is also the narrator. He is a film student and an executive at a television studio. Young and highly successful, with a promising future, he is constantly looking over his shoulder to see if any younger competitor is emerging and at the same time looking forward to the people he needs to surpass. Like Janus of the myths, he is looking in both directions. He seems to be living in a vacuum. The beginning of the novel itself reveals his current mindset: 'Then we came to the end of another dull and lurid year.' (P.S Joshua Ferris's first novel is named after the first part of this line: 'Then we came to end'). As the novel progresses, David sinks into a state of ennui. He loses interest in his work, doesn't care about the ratings, and generally settles into a stupor of blank emptiness. He knows he is neglecting his work and that it will have serious consequences, but he couldn't care less. It's like sitting on a ticking bomb or driving a car at high speed towards a mountain cliff. You know you're going to crash, but you're beyond caring about what's going to happen. (Shades of this mood can be seen in Eric Packer of DeLillo's 2003 novel, and some things don't seem to change over the years, do they?). This part of the novel is sometimes funny, with a lot of black humor, but nothing really new if you've read other office novels ('Something happened' comes to mind). At the end of the first part, David finally wakes up from his ennui and goes on a road trip with a video camera, officially for work but in reality on a personal quest. This is the second part of the novel.
Armed with his camera, David ventures into the heartland of America, to a sort of nowhere land. He meets various people. As his trip progresses, David starts using his camera as a voyeuristic tool, capturing people at their most primitive level, with all their defenses down. People are willing to bare their deepest thoughts about families, friends, and relationships in front of the camera. They are even ready to perform sexual acts in front of the camera. It's not just about voyeurism but also about the willingness of people to be the object of voyeurism. This is something very relevant in today's era of reality shows, MMS scandals, and so on. In some ways, DeLillo seems to have predicted in the 70's what's happening today. David becomes increasingly distanced from the reality of his professional life, which is spiraling towards disaster, and becomes more and more obsessed with the trip and the camera itself, capturing not only people but also the American landscape and having reminiscences about his childhood. The novel meanders all over the place (much like the protagonist) and ends with David going off to Dallas to the site of Kennedy's assassination. (Again, a more American preoccupation from the 60's and 70's about Kennedy's assassination).
Check out this link (http://www.newyorker.com/fiction/feat...) of a DeLillo short story.