Let the Right One In S01E05 - Quoquo Modo Necessarium
Summary:
Mark moves quickly to clean up a mess, and Zeke gets roped in to help. Claire is hit with a major setback at the lab and Matthew proposes a solution. Meanwhile, Naomi makes a devastating discovery that confirms her worst fears.
Follows a 12-year-old girl who lives a closed-in life after turning into a vampire, only able to go out at night. Her father does his best to provide her with the minimal amount of human blood she needs to stay alive.