What is plot in a book review? Is it a summary or analysis?

Basic plot:
beginning, rise in action or tension, theof the story, the unraveling of the story (the part
where you begin to get what's going on, and then the falling action and return to normalcy or
the feeling that things will have some kind of return to being right again. 

A summary is something you tell or write about a story. You sum up what it was about. 
Think of it as telling your friend what a movie was about, including the ending.

An analysis is entirely different than either plot or summary. Analysis can describe
why you enjoyed or didn't enjoy a story. It examines the writer's technique. It might include
how the author uses symbols, metaphors, builds a character, etc.

The most
frequent mistake students make in writing a literary analysis is to write a plot summary instead
of an analysis.  Your teacher might have said avoid plot summary.  Or he or she might have said
to write a brief summary of the plot followed by an analysis. Be sure to look at what these
words mean and read your directions carefully.