Nine years ago Polish director Michał Marczak won the directing prize at Sundance for his visceral documentary drama All These Sleepless Nights (2016, trailer) and is now back taking on a new harrowing story with Closure. The film follows a father as he scours the depths of Poland’s Vistula River in search of his missing teenage son. The story came to Marczak when he met the film’s main subject, Daniel, as he was on the river and knew this was a story that had to be told.