In this text we can read about Harry's walk to the city without teacher's known.
In first book Harry Potter soombody give him like present an Invisible Cloack.
And in this book also Gearg and Fred give him a map.
This map is invisible.
If you want to see that map you must put your magic stik on it and say magic words.
Then Harry thent to the city he used that to find.
He where an Inviseble Cloak and go by secrets ways what is showing an Inviseblle Map.
When he come back Malfoy said to Mr Snape What Harry was in city.
But Harry said that he was in his bedroom.
Then Professor Lupin helped Harry.
And he took that inviseble map.