The Atlas of Us, by Kristin Dwyer

When Atlas's father dies, he leaves behind a list of to-do's, one of which was to reopen a trail in the western Sierras and hav ethe two of them hike it together.  Atlas can't ever do that hike with her Dad, but she gets a job on the team that is rehabilitating the trail during the summer.  

It's hard and dangerous work, but the project gives Atlas some focus and takes her mind away from her grief.  Best of all, there's a policy that everyone uses aliases (Atlas renames herself "Maps") and no one is allowed to tallk about their pasts or where they came from.  The anonymity suits her fine.  But when she finds herself falling in love with King, the guy in charge of their team, she's in far over her head.

Featuring a diverse and distinct cast of characters, each of which are drawn out in fine detail, Dwyer's novel explores the slow reopening of Atlas's heart, her healing from loss, and her struggles with grief and depression.  The material is not new and Dwyer doesn't produce any fresh revelations, but the pacing is excellent and the storytelling compelling.  Dwyer knows how to feed the romantic flames gradually, never overloading the fire with excess fuel, and the result is a steady burn of a romance that relies as much on what is not said as what is.  The development of Atlas and King's relationship feels rough and raw and entirely authentic.  Combined with the aforementioned strong supporting roles played by the other young people on the team produces a surprisingly warm story of bonding in the woods.