Based on the 1966 science fiction novel Make Room! Make Room! by the legendary Harry Harrison, the movie is a cocktail of police procedural and eco-disaster science fiction.

The year is 2022 and the Earth is in trouble.  Millions are hungry and homeless, and the Soylent Corporation are supplying Soylent Green. a high-protein foodstuff allegedly made from plankton, but is it?

Frank Thorn, a cynical NY detective is called in to  investigate the death of a Soylent executive, and he soon suspects that it was assassination. And so begins the hunt for the truth.