Impostor

There are many heroes. Brave, strong, invincible. Madly lucky and loved ones. Heroes who are waiting for prophecies and artifacts. But this book is not about them. She is about a man on the sight of usual. He is not a brave and not cowardly. He is not lucky, but not a loser. He is just a modern man who knows something, something knows something, he guesses something. And in this, only in this its advantage.
Once he makes a mistake and turns out to be in a world where the Middle Ages reigns and the mind is inferior to rough strength ... So does it make sense to fight with many powerful enemies, if it is very, weak? Maybe you need to just hide, trembling with fear every minute for your own life? So is there a chance in a person who does not have any superposts, challenge to everyone and change this world?