Charlotte's memories of the 1965 are triggered when she visits the flat of a recently deceased friend.

In 2012, Charlotte is joined by two former flatmates to clear the flat; Lilly faces a terrible personal crisis; at a violent anti-Vietnam war demonstration Jack and Victor face a challenge that will define their perceptions of each other forever.

A fourth former flatmate arrives; an IRA bombing campaign targets London; Alan makes a play for Lilly; Charlotte's relationship with Jack implodes; Orla endures a family crisis.

The flatmates celebrate Alan and Lilly's wedding; Jay decides to come out to his parents; Jack's aspirations are threatened; Victor is arrested.

The flatmates await the arrival of a sixth; Jay and Orla help detox Jack; Charlotte discovers that Jack's hold over her is threatening.

It's 1990 and the room is for sale; Orla organises one last reunion for the roommates; a brutal revelation has cataclysmic consequences; in the present, the last surviving roommate arrives and the identity of the deceased is finally revealed.