In the distant future, a population boom leads to shortages of food, water and shelter. The world-wide government passes a law on a one-child-per-family policy. During this difficult time, seven twin girls are born, hidden by their grandfather because their mother died in childbirth. Named after the days of the week, they are trained from childhood to act like one person to keep their secret from the people around them and the police who check everyone on every street corner. That's how the girls appear in public - each on a different day. But one day Monday goes missing.

A terrible virus has descended upon mankind - the infected are completely unable to control themselves. Rage, lust, fear, and other emotions and impulses usually restrained by civilized people burst out, but in eight hours the effect of the virus wears off.

Derek Cho worked long and hard to get a good position in a large law firm. One day a colleague with a higher position and strong influence sets him up in front of a client and in front of his boss, and that very morning a virus hits their office skyscraper. The building is cordoned off, lawlessness begins inside, and Derek decides to use this opportunity to restore justice.

The flighty Emily is in her 30s and has just been dumped by her boyfriend. Now she needs to find a traveling companion for a trip to Ecuador to replace her ex-boyfriend. Emily manages to persuade her overcautious mother to make the trip together. But instead of a quiet family vacation, her daughter and her mother are kidnapped. And when such different women are held hostage together, their kinship is tested to the limit. Perhaps they will become even closer to each other, but only if they manage to escape and survive in the jungle.

Several bodies are discovered in the city, the owners of which have met a decidedly bad end. All evidence points to John Kramer, but the man known as Jigsaw has been dead for over a decade. It seems to have found someone who has taken the path of the legendary maniac.