Watch Sum of Histories

Physics professor Viktor has made a discovery that could change everything. His invention allows him to send emails into the past, and though the possibilities are endless, none are more important than the potential to reconstruct a life with the woman he loves. But for every action there is a reaction, and the consequences of Viktor's meddling may not add up to the future he planned.

Sum of Histories is a 2017 drama with a runtime of 1 hour and 27 minutes. It has received mostly positive reviews from critics and viewers, who have given it an IMDb score of 6.8.