When the national economy collapses into chaos, the Mortimer family retreats to a fortified house in the countryside to survive the ensuing social breakdown. Barry Mortimer, the eldest son, observes his father's transformation from a provider to an authoritarian figure who treats their home as a fortress. As food supplies dwindle and desperate outsiders approach their gates, the family must navigate the moral implications of their isolation. The narrative is presented through a third-person perspective that emphasizes the shifting power dynamics within the household. The physical constraints of the house and the surrounding landscape dictate the family's limited options for interaction with the outside world.

Readers often note the stark, realistic tone Townsend employs to depict the breakdown of order. Discussion frequently centers on the ethical dilemmas faced by the protagonist as he questions his father's increasingly rigid control. Critics highlight the effectiveness of the house as a symbol for both protection and imprisonment. The narrative is frequently praised for its focus on character development over sensationalized action sequences. Many readers find the exploration of how ordinary people react to extreme circumstances to be the most compelling aspect of the work.