Mine would have to be Book 2 because of the unity of the nine in the Fellowship and the apprehension that Frodo might not be safe from Gollum for much longer. Although having said that Book 5 is quite exciting because it’s so far into the story and so near to the conclusion.
Book 1. Begins with a Long expected Party and ends with Flight to the Ford.
Book 2. Begins with Many Meetings and ends with The Breaking of the Fellowship.
Book 3. Begins with The Departure of Boromir and ends with The Palantír.
Book 4. Begins with The Taming of Sméagol and ends with The choices of Master Samwise.
Book 5. Begins with Minas Tirith and ends with The Black Gate Opens.
Book 6. Begins with The Tower of Cirith Ungol and ends with The Grey Havens.
To save you guys going back through the books.

[b:3l32d75o]J Dwarf[/b:3l32d75o]