What is missing from the popular book title: "Harry Potter and the Prisoner of ..."?

I watch this movie on Netflix season one to ten

I like most this 3rd. book of Harry's series, because I can imagine that Prof. Snape was in love for Lily and when Snape killed Dumbledore in the 6th. book I supposed there were something there weren't revealed yet... I like how Stephen Fry tell the story, it's fascinating

loved Harry Potter Stories but didn"t see all parts of it

And even more Harry Potter questions....

Harry Potter and the Prisoner of Azkaban is the best book I've read. I'm a complete Potterhead...