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In 2027, people on earth lost their fertility for unknown reasons, and no baby was born since 19. Britain is shrouded in a kind of black with no future and future. Most negative people have given up all hope in the face of the imminent extinction of mankind. They flout the law, rob, smash and rob at will, and the proliferation of guns makes the city where people live become a dangerous zone of fear. At this time, Britain was under the rule of the military. They drove all the immigrants who poured into Britain out of the city and gathered in a concentration camp specially prepared for immigrants.

Theo (clive owen) is a policeman in charge of immigration. Facing the gray future, his greatest pleasure is to visit his old partner Jasper (michael caine), who is hiding in the forest outside London. Former lover Julie (Julian Moore) entrusts him to apply for a legal identity card for a black girl and leave Britain safely. Since then, Theo's quiet life has become an adventure. When Theo learned that Ken (Claire Hope Asit), an illegal immigrant, was miraculously pregnant, she gradually became the patron saint who risked her life to avoid the bullets of pursuers and British soldiers.

When they fled to the refugee concentration camp, they encountered a more chaotic situation, with rebels and British soldiers fighting everywhere. In the turbulence, "Ken" gave birth to a baby girl with the last hope of mankind. With the help of enthusiasts who also hope that mankind can be saved, the two successfully crossed the dense rain of bullets, and Theo rowed the boat with the baby and mother gradually away from all the chaos. On the foggy water, seeing the lights and rescue boats on the sea not far away, Theo, who was shot several times, finally bowed his head like all heroes.