Blue Ruin

Dwight Evans is an unlikely avenging angel. His eyes flit about nervously above an unkempt beard and he lives in an abandoned car on the beach, where he collects plastic bottles and forages his lunch from litter bins. But when he hears that Will Cleland is being released from prison after 20 years, Evans springs into action. He steals a gun, races to the town where he used to live and without much ado kills Cleland.
In a regular revenge fantasy, this would be enough for the whole film. In Blue Ruin, however, it is just the prologue. We then have to wait for the bloodthirsty response from Cleland's family, and the inevitable reaction - until no one knows any more what started this whole vendetta off in the first place.
Unpredictable plot twists, jet-black humour and skilfully constructed suspense are the trump cards of this unorthodox thriller, which had a great reception in Cannes, attracting comparisons to the Coen brothers' Blood Simple.