Set in Athens, Greece, during the 1970s and 1980s, Kostas and Nikos are twin brothers who find themselves abandoned by the adults in their lives. After a traumatic childhood filled with loneliness, heartache, crime, foster homes, abuse, and forced child labor, they find opposite paths in life to cope with the painful scars inflicted. Kostas becomes a cop to tilt the scales of justice in the right direction, while Nikos seeks to right the wrongs of their childhood with his own brand of vengeance. In the ultimate tale of nature versus nurture, Nikos longs to feel something other than hatred and revenge. While Kostas just wants to put it all behind him and help those unable to help themselves. What He Didn't Know is a brilliant portrait of crime on the streets of Athens during a tumultuous time in the twins' lives. Two men-completely opposite in the paths they choose for themselves-yet their shared upbringing provides a common bond. But what he didn't know could cost Nikos his life ...