Kate Henderson's town isn't normal. Power issues, strange deaths. And they're being blamed on her little brother and her lover, along with the rest of the Hellfire club. She needs help from her friends, who just like her have been through the upside down before. (takes place around the beginning of season 4)
SPOILERS FOR VOLUME 2! I feel like we needed more closure and reactions on two main deaths from volume 2 so hear is some reactions (i wouldn't recommend if you don't want to cry)