"Sum of existence" is amateurish: amateurish acting, scripting and direction. I came across this film on TV one night and assumed it to be either an acting school's end of year film, or someone's private project. I watched it in disbelief that a, it had been made and b, it was being shown on free-to-air television. When I discovered it was backed with government money and all involved were allegedly professional, I was shocked. It is a poor attempt at a thriller, with clichéd situations. I can find nothing to recommend in this film. It is an embarrassment to the Australian film industry. The industry here is notoriously underfunded and it makes me angry that money should have been spent on this schlock. All those who were involved in funding and making it should have a good long hard look at themselves.