“Mockingjay,” the third and final book in “The Hunger Games” trilogy, was something of a surprise for me. A happy little surprise (not that the novel is a pleasant subject) for me to sink my literary teeth into. Unlike “Catching Fire,” which had a very slow start, “Mockingjay” hits the ground running. It manages to keep up this pace throughout most of the book, proving a theory of mine–that the author, Suzanne Collins, is very good at writing action and drama, but smaller, simpler ‘breathing’ scenes are a no-go. This is fine! She should play to her strengths, as she did here and in the original “The Hunger Games” novel.