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No Blade of Grass
The film opens with a montage of pollution, which, as implied by the narrator, is the cause of a virulent new disease arising in Asia, a virus that strikes all members of the grass family, including wheat, rice, and maize. It spreads to Africa, Europe and South America, bringing starvation, anarchy and cannibalism in its wake. Hundreds of millions die. The Chinese use nerve gas on their own population, killing 300 million, in their desperate attempts to survive.
A year after the start of the disaster, John Custance, his family and his daughter Mary's boyfriend, scientist Roger Burnham, leave London during rioting just before roadblocks are set up. They head for his brother David's farm in the north.
They stop at Mr. Sturdevant's shop to obtain firearms. When Sturdevant refuses to sell them any without the proper permits, John and Roger overpower him, but are held at gunpoint by his assistant, Andrew Pirrie. However, when John explains the situation to Pirrie, he shoots his employer, and he and his wife Clara join them.
To get past an Army roadblock, they are forced to shoot three soldiers. Later, the party become separated when Roger and Pirrie race each other in their cars. John's car is stopped by a gate at a train crossing. He is knocked out, and his wife and 16-year-old daughter are taken away and raped by three men. John and the others find them and shoot two of the men, but one gets away.
Later, they are stopped by vigilantes guarding their settlement and robbed of everything useful, including their vehicles and guns. Fortunately, they are only 50 miles (80 km) away from their goal. Now on foot, they come upon an isolated farmhouse. They kill the farmer and his wife and take their guns. While staying in an abandoned factory Pirrie's wife Clara attempts to seduce John and is shot by her husband. Mary and Pirrie become close, as Mary believes Pirrie can protect her. Next, they encounter a larger group trudging the other way. John offers to take them along to his brother's easily protected valley. Their leader objects and goes for his gun, so Pirrie shoots him. The others decide to join John's party.
As they walk beside a road, a motorcycle gang rides by. John's wife Ann recognizes one of them as the escaped rapist. The armed gang mount a series of mounted attacks, but are killed in the ensuing gun battle, as are some of John's people.
When they finally reach David's place, they see that it is well protected by a stone wall and a machine gun. David tells John privately that he cannot let such a large number of people in – the valley cannot feed so many – and suggests John sneak away from his group in the night with his family and Roger. Instead, John mounts a night attack. Pirrie shoots David, who is manning the machine gun, but is himself also killed. The attack is successful, and John takes charge of the valley.