Jimmy struggles with the weight of Tully's request, especially as Anna and Jimmy's wife, Iona, initially want Tully to fight the cancer with chemotherapy.

Jimmy, now a successful writer in London, receives a devastating phone call from Tully. He returns home to find that Tully has been diagnosed with terminal cancer and has only months to live. Tully makes a heartbreaking request: he wants Jimmy to help him travel to Switzerland for assisted dying so he can go out on his own terms.

Despite the diagnosis, Tully and Anna decide to get married, providing a bittersweet moment of joy amidst the tragedy.

Tully shares his news with Jimmy but initially wants to keep his plan for Switzerland a secret from his partner, Anna.