Answer #1: Well i dont know if its true but theres a rumour its going to be called Night Mare
Answer #2: It's called Death Portal
The fourth book in the Power of Five series is called "Necropolis."
Ravens Gate
Evil Star
The fifth book is called "A Dangerous Path".
The Princess Diaries: Give Me Five is the name/title of the fifth book in The Princess Diaries series.
five
we are not sure but maybe as the pentagram series has 5 parts so will the gatekeepers but there are doubts that the name of the book has been come out. a guess made by some people is that the name of the book is 'the horror within'. but we can never be sure so look out for the name. As of September 2010 the name is still unreleased. Few have thought that the name was "the power of five", but that is just what the series is called in countries other than the US.
The name of the fifth book was Waterwings but they changed the name to MAX
everlasting is the name of the last book
The fifth book in The Lightning Thief series is "The Last Olympian."
the name of the 5th 39 clues book is the black circle
The Last Olympian