A teenage girl is captured by a giant mutated squid-like creature that appears from Seoul's Han River after toxic waste was dumped in it, prompting her family into a frantic search for her.
In a flooded future London, Detective Harley Stone hunts a serial killer who murdered his partner and has haunted him ever since — but he soon discovers what he is hunting might not be human.
Paranoid computer programmer Simon wakes up to find a package in his room one day. Despite attempts at securing his apartment, the packages keep arriving. While cameras watch Simon's every move, he struggles to find the answers to the mysterious forces taking over his life.