Left: Beads from the cache found beneath a residential building at Tell Brak of the mid-4th millennium BC. Right: Alabaster bear figurine, height 9 cm, mid-4th millennium BC. Traces of red and black pigment survive on the head and claws. ( Antiquity)
A plot summary is a description of the story in a novel, film or other piece of storytelling. It is not a review and should not contain the opinions of the author.
All fictional stories have a plot. Plot is the sequence of events that take place in the story. Well, a plot isn't the same thing as a summary. But if you are describing a plot, you would probably do so by writing a summary of it.