The Ghost In A Mirror is a story that explains a game that some people play to summon spirits from the dead.

Plot
This is a scary game that people play to conjure up a ghost in the mirror. Many don't really believe that a ghost is going to appear. But they raise one anyway, for the fun and excitement. Some are willing to settle for any ghost, but others have a particular ghost in mind. One of these is a ghost named Mary Worth, who is also known as Mary Jane and Bloody Mary. She is the heroine of an old comic strip, but some say she actually was a witch who was hanged at the infamous witch trials in Salem, Massachusetts, in 1692.
Another of these ghosts is "La Llorona," the Weeping Woman who wanders the streets of cities and towns from Texas to California and throughout Mexico, looking for her lost child.
Still another is Mary Whales, a young woman who is supposed to have been killed in a car accident in Indianapolis, Indiana, about 1965. Her ghost is one of the "vanishing hitchhikers." It is said that again and again she thumbs a ride home in a passing car, then vanishes before she gets there.
Here is how Ghost Hunters try to raise a ghost:
1. They find a quiet bathroom, close the door and turn off the lights. 2. While they stare at their face in the mirror, they repeat the ghost's name, usually three times. If they manage to raise one, its face will slowly replace their face in the mirror.
Some say a ghost is likely to be angry at being disturbed. If it gets angry enough, it will shatter the mirror and come right into the room. But a player can turn on the lights and send the ghost back to where it came from. And when that happens, the game is over.