In The book I read over summer, BZRK by Micheal Grant, Noah and Sadie are the two main characters  who also interact with one another the most. Noah and Sadie will become known as Keats and Plath later on in the book so I will be referring to them using those names. Through out the story Keats' and Plath's characters both push along the sci-fi theme of the book. This starts with when they both become involved with an organization called berserk. This organization uses Biots which are tiny, microscopic, organisms to wire the brains of people and influence decision making. The two of them become a twitcher team, being thrown into this high stakes situation out of the blue makes Keats and Plath rely on each other for emotional support as they delve deeper into the main conflict. Twitchers are the people who control biots, or nanobots which are used by the enemy. through out the rest of the book its pretty much out of the frying pan and into the fire for our two main characters as they are put on their first ( and rather important ) mission, with little to no training. they are assigned the mission of wiring the brain of the people running the enemy team, The Armstrong Fancy Gifts Corporation.
As they both take a toll, both physically and mentally, on this impossible and borderline suicidal mission, they are brought even closer together and both relate to each other in a deeper way when they both realize how much there is to lose and how much they have lost.

BZRK Article

* The BZRK article is about how the book is being developed into a full-length movie.