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In the 1940s in Scotland, young boy Angus MacMorrow lives in a large house with his mother and sister and a maid, and later also another servant. As Angus has been told, his father is missing since his ship has been sunk in the war, so it is very likely that he is dead. However, Angus hopes he is still alive. He discovers a big mysterious egg and cares for what hatches of it: a 'water horse' that becomes the fabled Loch Ness Monster. As an old Angus explains in flash-forwards, there is always only one such creature: creatures of this species asexually reproduce through parthenogenesis, and always die after laying an egg.

Young Angus keeps the creature a secret, but later he tells his sister and the male servant. A group of soldiers involved in the defense against possible attacking or hiding German U-boats is stationed in and near the house. The creature is sometimes attacked by the dog of the soldiers. It grows fast and is brought to the lake.

It is still friends with Angus, and lets him ride it underwater, coming to the surface from time to time for breathing. However, it suffers from shells shot into the lake for practice, and attacks the soldiers. It kills the dog, and is about to kill a soldier, but Angus convinces him to refrain from that. At first it cannot leave the lake due to an anti-submarine net intended to catch possible German U-boats entering the lake, but later it succeeds. Angus finally accepts the creature's departure, and also that his father died.

After the story was told (eventually the story-teller reveals himself to be Angus MacMorrow), a mother calls out to his son, who is walking down the beach and spots a rock. The rock looks similar to the egg that the 'water horse' had hatched from and the last thing that is heard is a crack from the egg.