At first blush, Twinless sounds like typical Sundance fare — a twee, tear-jerking indie that, despite boasting a recognizable face, will have a quiet release and otherwise fade into the ether.

Yet thanks to its deftly twisty black comedy and a breakout performance from Dylan O’Brien, writer, director, and co-star James Sweeney’s sophomore feature has emerged as one of this year’s best surprises.

Twinless, in theaters Sept. 5, is up front about its tonal irreverence from the get go — a quiet Portland street suddenly upended by an offscreen hit-and-run immediately smash-cuts to a funeral where errant sobs clunkily intermingle with the violinist’s pitchiness. No one is more adrift than Roman (O’Brien), who has buried his identical twin Rocky for all of two minutes before being confronted b

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