In the third season finale, Allison's life, along with the lives of her family, is uprooted as her psychic abilities are revealed to the public. Allison must now find a way to catch the "recapitator" serial killer on her own, as she can no longer turn to Devalos or Scanlon for help.

A series of mysterious fire-related deaths may be tied to Allison's dreams of a blaze. Allison must also think about where her professional career is headed, as Devalos starts thinking seriously about running for mayor.

When Allison becomes a lawyer and Joe starts a new job, the Dubois family is forever changed on the series finale of Medium.