In William Shaksepears "Romeo and juliet", the story reaches it literary climax in act 3.
“And fire-eyed fury be my conduct now!
Now, Tybalt, take the ‘villain’ back again
That late thou gavest me; for Mercutio’s soul
Is but a little way above our heads,”
As soon as he killed Tybalt Romeo then says
"O! I am fortunes fool!"
Thats just one example of literary climax. Literary limax usually happen toward the middle/end of a story.