In the summer of 1973, five men and six women embarked on a 101-day scientific sea-adventure, drafting on a small raft named “Acali” across the Atlantic. In a experiment initiated by Mexican anthropologist Santiago Genovés, the group set out to explore the origins of violence and the dynamics of sexual attraction. As leader of the experiment, Genovés had hoped to report tales of orgies and violent conflicts, but it seems that the outcome was very different. Instead of fighting or having sex, the group slowly turned against him. Now, more than forty years later, the surviving members of ‘The Acali Expedition’ reunite in a film studio in Stockholm, board a reconstruction of the raft and tell the hidden story behind what has been described as ‘one of the strangest group experiments of all time.’