Plum tells the story of Peter “Plum” Lum, a legendary retired rugby league player from Cronulla, Australia. Plum was once a local hero, winning championships with the local Cronulla Sharks team. But years have passed since then, and now Plum is struggling with troubling symptoms. He experiences memory loss, blurred vision, and disturbing hallucinations—all potential results of the head injuries he sustained during his playing career.

Plum seems to be suffering from chronic traumatic encephalopathy, or Cte, a degenerative brain condition linked to repeated blows to the head. Like many athletes before him, Plum must now face the unwelcome realization that the very sport he excelled at may be causing his current struggles. To make matters worse, Plum’s symptoms are straining his relationships and challenging his sense of identity. Who is he if not a proud rugby champion?

Through it all, Plum leans on those close to him,...