After a bank robbery, four criminals escape to Mexico, but a storm causes an accident which takes down the plane where several die in the crash. The criminals take it into their own hands to continue when one survivor is attacked and eaten by a crocodile. The criminals kill it, but from then on the mother Crocodile is on a killing spree with a goal to kill each survivor. But that is not the only worry, because they're trapped within it's world, and if it doesn't kill them, the criminals will.

Randi Stewart is a sergeant on a marine base where her father is the commanding officer. She is being treated by the new base psychiatrist, Bill Turner. Her brother, Gordon Stewart is running for political office. General Stewart is murdered and Randi is the key suspect. Once Bill starts investigating the crime through his treatment of Randi, he begins to uncover an unusually large amount of suicides on the base. The intrigue grows and so does Bill's unprofessional feelings towards Randi. Is she the murderer? He doesn't really want to find out. He just keeps getting sucked deeper and deeper into the "Quicksand".