"Beneath the Harvest Sky" is what happens when an otherwise astutely made coming-of-age drama is thrashed to pieces by a woefully out-of-control screenplay. Made in partnership with the TERRA Chips company (the original title was even "Blue Potato"), this indie slice-of-life—the fictional debut of documentary filmmakers Aron Gaudet and Gita Pullapilly—stars Callan McAuliffe (2013's "The Great Gatsby") and the magnetic Emory Cohen (2013's "The Place Beyond the Pines") as best friends Dominic and Casper, high school seniors with plans to escape their nowhere hometown of Van Buren, Maine, for the big city of Boston after graduation. When the rebellious Casper discovers girlfriend Tasha (Zoe Levin) is pregnant and gets pulled into drug-running for his no-good dad (Aidan Gillen), the more responsible Dominic sees their futures suddenly heading in very different directions. The performances in "Beneath the Harvest Sky" are better than the movie itself, an exceedingly derivative teen melodrama that too often loses focus and meanders off on lugubrious tangents with its criminal subplots. Its most fatal misstep, however, is a ridiculously overwrought climax featuring the arrival of a devastating storm, a freak accident, police arrests and a suicide all within the same five-minute period. This ending is simultaneously implausible, strained and insulting, a ruinous exclamation point on a film that has enough strong qualities to deserve a page-one rewrite.