The American drama series "Let the Right One In" tells the story of a man named Mark and his 12-year-old daughter Eleanor, whose lives were dramatically changed 10 years ago when the girl turned into a vampire. Now they are forced to lead a secluded life in order to avoid attracting unnecessary attention and revealing their terrifying secret. Eleanor only ventures out at night, under the cover of darkness. And Mark does everything possible to provide his daughter with human blood, which she needs to survive.