A former NKVD officer and an opportunist become partners in search of hidden KGB treasures, which creates a clash between stale past Soviet times and new Lithuania.
Laura, the bride, is at the point of escaping her own wedding party when she's stopped by her dad, Oskaras, a corrupt politician, who wants his sophisticated and exquisite daughter to marry a small town man Edgaras in order to fix his damaged reputation. Oskaras hires Giedrius as the wedding's emcee, who is later criticized by PR specialist Darius. Two older gentlemen, following primitive wedding traditions, begin chasing down Giedrius to hang him for his lies. The groom's younger brother Pasha, and Laura's younger sister Goda later begin falling in love themselves. As time passes, the bride and groom begin to realize that they might have overestimated just how well they really know each other - there's lots of decision making that needs to be done.
n 1941, a Lithuanian man kills his neighbour Jew, Isaac, at the Lietukis garage massacre. Twenty five years later in Soviet Lithuania, movie director Gediminas Gutauskas returns from the USA with a screenplay of a film that portrays, in details, the Lietukis garage massacre and describes a particular situation where Isaac, the Jew, is killed. The screenplay is later brought to the attention and investigated by the KGB. Why does a director, who once relocated to the USA, return to Soviet Lithuania? Why is his scenario so unusually historically accurate to the massacre, as though he would have witnessed it himself? Perhaps he knows someone who attended the massacre themselves? The aftermath of the murder returns many years later to cripple life and love. ISAAC is a trip into the past, and its rotting world, based on the neighbour Isaac's rotten murder.