Make Room! Make Room! , by Harry Harrison
currently $1.99 at Amazon US
http://www.amazon.com/Make-Room-Rose.../dp/B003XRELMA
This novel, originally published in 1966, was the basis for the movie Soylent Green.
" A teeming New York City and a detective's pursuit of a killer and nefarious racketeer comprise this novel. While the novel contains elements of classic detective fiction--the hard-boiled protagonist, the seductive mistress, the portraits of corruption and perfidy--Harrison's true concern is less the story itself and more the opportunity the story offers to give the reader a glance at a dismal and broken world. The state of overpopulation has altered life in innumerable ways, and Harrison is keenly interested in documenting the catastrophic effects of this burden on all human relationships."
KentE