Pretty much a zombie story at first (28 Days Later infected even), typical world ends and survivors keep surviving, the way the story goes is that it becomes increasingly absurd that you just have to laugh yet just the sight of it would be incredibly creepy. The plot starts from day 1 and literally everyone disappears, the main character is searching for other people alive which he does eventually after a few days, those he comes into contact with also don't know where everyone disappeared and they start to survive together trying to understand what just happened about where everyone went, days or weeks later, the remaining human population came back and were perceived by the survivors that they were infected with something. As time goes by (days, weeks, months and years), the "infected" quickly start having abnormalities. The infected are not really infected by anything. No alien parasite, no virus, no fungal epidemic, no vampires, no bio-weapon no nothing, they just exist. They just happened and as the title suggests, I don't want to answer why the infected are becoming like this or their true origins. I want to focus on the survivors on how the deal with such creature that constantly comes out with something new, dealing with the fact that these things even exist, it looks human but it isn't human. It's not a story of humans are the real monsters, it's really a story of how one can fight something that defies physics, the idea of something that comes back even more dangerous and unpredictable and how maddening/troublesome it is to fight just one. Would you prefer to discover why every human disappeared one day and only pockets of humans were left alone, what these creatures are and where they came from? I feel it would ruin the suspense, each encounter with the infected will always be different. I find it really unrealistic for a simple survivor to go on a journey and find out the origins of such.