In the Wild Light by Jeff Zentner
Life in a small Appalachian town is not easy. Cash lost his mother to an opioid addiction and his Papaw is dying slowly from emphysema. Dodging drug dealers and watching out for his best friend, Delaney, is second nature. He's been spending his summer mowing lawns while she works at Dairy Queen. But when Delaney manages to secure both of them full rides to an elite prep school in Connecticut, Cash will have to grapple with his need to protect and love Delaney, and his love for the grandparents who saved him and the town he has to leave behind.