Here's a summary:
The story takes place on a planet orbiting a red dwarf star, where the sun only shines for a few hours every couple of years. A group of children, bored and frustrated with their dim world, decide to play a prank on one of their friends, Harvey. They lock him in a shed to scare him, thinking he'll be scared of the dark. However, an unexpected solar flare causes the sun to shine brightly for an extended period, and Harvey is the only one who can witness the incredible sight. He is forever changed by his experience, while the other children are left with a sense of regret and wonder.
This story explores themes of isolation, discovery, and the importance of perspective. It's a classic example of Clarke's ability to blend science fiction with profound human insight.