Six years after her husband, a prominent Belgrade lawyer, died in a fire, Anja Kolar receives information that makes her question everything she thought she knew about the accident and about her own family as well. At the same time the sudden death of his best friend's daughter draws police inspector Dejan Strbac into a whirlpool of crimes, starting with the mysterious disappearance of a young female lawyer, which took place six years earlier.

The Sixth Bus is a film about a young woman trying to find out how her father disappeared never to be found, during a war in Croatia that stunned Europe and the world. It m.77mi.cc is about a search for identity; simmering beneath this need for resolution. The Sixth Bus is a search for truth in a place where truth is selective, elusive and even feared.

1958年，冷战期间，在贝尔格莱德附近的温卡科学研究所，两位科学家、两个世界和两种意识形态面临着一场生存考验。