Star Wars: Before the Awakening by Greg Rucka

FN-2187 is a promising and talented Stormtrooper who's only weakness is that he cares too deeply for his squad and longs to find where he fits in. Rey is an orphaned scavenger on Jakku who happens across the find of a lifetime, an almost fully functional ship that can be traded for enough food portions to last over a year. Poe Dameron is a skilled pilot who goes against the rules to find the truth behind a First Order attack that leads him directly into the Resistance. This book tells the stories of these three heroes before the events in Star Wars Episode 7: The Force Awakens.