Eli is 12 years old. She's been 12 for over 200 years, and she just moved in next door.
When Oskar, a sensitive, bullied 12-year-old boy, meets his new neighbor, the mysterious and moody Eli, they strike up a friendship. Initially reserved with each other, Oskar and Eli slowly form a close bond, but it soon becomes apparent that she is no ordinary young girl.
A child of divorced parents, Oskar (Kåre Hedebrant) is frequently the victim of a trio of school bullies and at night, in the snow-covered park near his Stockholm home, he dreams of finally fighting back. One such night, he encounters the curious girl-next-door and over a period of evenings the pair start to become friends. She is Eli (Lina Leandersson) and she is quite a mysterious young girl. She is twelve, like him, but has no idea when her birthday is and she is also particularly adept at solving the Rubiks cube (I usually had to dismantle mine and rebuild it!). All the while, their community is being rocked by the discovery of some exsanguined bodies, and so might Oskar be able to put two and two together and is he in even more danger ...