The Client by John Grisham

The Client (1993) is a legal thriller written by American author John Grisham, set mostly in Memphis, Tennessee and New Orleans, Louisiana. The book The Client is a mix with various legal elements and suspense.
The Client begins with a eleven-year old boy, Mark Sway and his younger brother Ricky, who is eight, going into the woods near the Tucker Wheel Estates, a mobile home park where they live with their mother, Dianne. Ricky had earlier caught Mark with some cigarettes and now to keep Ricky's silence, Mark is going to teach Ricky how to smoke. While they are in the woods, a shiny black 4-door Lincoln (a black 1993 Cadillac Fleetwood Brougham in the film) arrives, and soon W. Jerome "Romey" Clifford, a 44-year old lawyer from New Orleans, Louisiana, gets out of the car. His only client at the moment is Barry "The Blade" Muldanno. And now here in the woods of northeast Memphis, Tennessee, he is attempting to commit suicideMark and Ricky Sway sit hidden from Clifford and watching him from behind the shiny black car. Clifford, noticeably drunk, puts one end of a garden hose in the exhaust pipe of the car and the other end into a rear passenger window, and rolls up the window, trying to kill himself with carbon monoxide poisoning. Mark, sneaks up, crawling on his stomach, and pulls the hose from the exhaust trying to stop him. After some time Clifford gets out of the car, cursing, and puts the hose back in. Mark repeats pulling the hose from the tailpipe. On the third attempt, Clifford sees the grass moving in the rear view mirror, leaps from the car grabs Mark and pushes him into the car. Jerome then tells Mark why he wants to kill himself... (Summary by Wikipedia)