Ráðherrann centers on Benedikt Rikhardsson, whose unorthodox approach to politics leads him to become the country's next prime minister. But Benedict suffers from bipolar disorder – and as his health deteriorates, some help him hide the illness, while others seek to abuse it.
Benedikt's mental health deteriorates after he resigns, and he follows a strict routine to deal with it. Steinunn supports him and at the same time copes with political pressure. Grímur tries to step into Benedikt's role, but meets opposition within the party.
Christmas is approaching and growing concerns about Benedikt's mental health are causing tension at home. Steinunn who is pregnant and worried tries to support him. As the birth approaches, Benedikt has to decide what he wants.
