Jeff Dahmer is an awkward teenager struggling to make it through high school with a family life in ruins. He collects roadkill, fixates on a neighbourhood jogger, and copes with his unstable mother and well-intentioned father. He begins to act out at school, and his goofball antics win over a group of band-nerds who form The Dahmer Fan Club, headed by Derf Backderf. But this camaraderie can’t mask his growing depravity. Approaching graduation, Jeff spirals further out of control, inching ever closer to madness.