Trama

Four children live with their terminally ill mother. After she dies, they try to hold things together. In their isolated house, they begin to deteriorate mentally, whilst they hide their mom's decomposing corpse in a makeshift concrete sarcophagus.

After her husband's death, the mother of Julie, Jack, Sue, and Tom begins to suffer from an unidentified illness. Rather than going to hospital and letting the authorities foster her children, she opens a bank account for them so they can be financially self-sufficient and will be able to avoid being taken into care by the authorities. After she dies, the two older siblings decide to hide her body in the basement. Soon they begin to suffer both the emotional strains and pressures of their situation, as well as the changes that happen during adolescence.—Jagged-11

In late 1970s England, Jack is a narcissistic 15-year-old boy living in a post-war era prefab house with his parents, his annoying 17-year-old sister Julie, 13-year-old sister Sue, and 6-year-old brother Tom. One day, while unloading large bags of cement to resurface the garden path of their home, the father collapses from a heart attack and dies. Only a few months after this tragedy, Jack's mother takes ill and becomes bedridden and frail, prompting Jack and Julie to take control of the household.

Though Jack and Julie initially clash due to Jack's immaturity and selfishness, the pair's tension gradually shifts to a romantic one as Jack develops an incestuous crush on Julie. In their new roles as the parental figures in the family, Jack finds himself escorting Sue and Tom to and from school, while Julie takes up the cooking and cleaning duties.

Jack's mother informs him that her illness has become worse and she will have to go to the hospital for a couple of months. She tells Jack and Julie not to tell anyone about her absence, or else the remaining family members will be forced into foster care and their home will be torn down. Shortly afterwards, the mother dies at home of her illness. In an attempt to conceal their mother's death from authorities and thus evade placement into foster care, Jack and Julie entomb their mother's body in the basement, in a cement sarcophagus made from the leftover bags of cement that Jack's father had bought.

The children become more withdrawn and their mental states further disintegrate as time passes with no adult supervision following their mother's death. Though Jack slowly matures, he stops bathing. Sue becomes more introverted, distancing herself from her siblings and confiding only in her diary. Julie forms a relationship with an older man named Derek, whom Jack starts to view with jealousy and hostility. Tom, attempting to remodel himself as a girl, takes up cross-dressing, then later regresses to an infantile state, sleeping in Julie's room in a crib and drinking from a bottle.

When Derek becomes suspicious of the unpleasant smell coming from the basement and investigates, Jack lies and tells Derek that the sarcophagus contains a dead dog, subtly alluding to his mother in the process. Jack is awakened by Tom's crying; Tom reveals that Derek has told him that the sarcophagus actually contains their mother. Jack realizes that Julie has exposed their secret. The next morning, Julie wakes Jack and confides to him that she and Derek are not physically intimate and that he is an immature adult who lives with his mother. Their conversation becomes more intimate, with Julie undressing and the two cuddling while contemplating the future now that someone else knows their family's secret. Jack is convinced that they will be taken into foster care, and their house will be torn down like the other prefabs in the area. He predicts that one day, someone will only find a few bricks among tall grass. Derek suddenly walks in on the two in bed together and expresses his disgust and horror at their incest. Unperturbed, Jack and Julie continue their conversation in bed, and conclude with the shared belief that their situation is natural. The pair make love as the sound of Derek demolishing the sarcophagus reverberates throughout the house. As Jack and Julie fall asleep together, police lights flicker against the walls.