Pure is ultimately told through a third person (omniscient) lens; however, it's not your everyday narrative technique. Pure has four different characters which the novel focuses on: Pressia, Partridge, Lyda, and El Capitan. The POV rotates between these characters, and we get a sense of each of their unique worlds.
But the characters in Pure don't use "I." Instead, a third person narrator is able to dive into their mind and give the reader the pleasure of knowing their thoughts and feelings. Here's an example of what we're talking about:
Partridge feels guilty before Lyda walks off, but he's relieved once she has. It's part of his plan. (8.1)
Hooray, rotating omniscience. This narrative technique lets us get close to the beating heart and inner thoughts of the characters we like—and relate to—best.