A rookie female reporter investigates a string of mysterious murders during an environmental disaster in Florida. The killings lead to an escaped convict, who has morphed into a bloodthirsty monster after he disappears into the red tide.

After the earth’s water supply is depleted, the survivors form roving road gangs, armed to the teeth and desperate to find and protect water supplies. But when a new breed of blood-drinking humans emerges, the survivors must contend with a whole new threat to their existence.