Hugh "Shuggie" Bain spends his 1980s childhood in public housing in Glasgow, Scotland. Thatcher's war on heavy industry has put husbands and sons out of work, and the city's notorious drugs epidemic is waiting in the wings. His mother Agnes is Shuggie's guiding light but a burden for his siblings. Dreaming of a house with its own front door and ordering happiness on credit as her husband philanders, Agnes keeps her pride by looking good but finds solace in drink. As she swings between alcoholic binges and sobriety, Agnes's addiction has the power to eclipse everyone close to her-- especially her beloved Shuggie.