Free energy, available for everyone, endlessly and free of charge – a dream that has inspired humanity for a long time. If we could find such a source of energy, it would revolutionize the world. Around the globe, many serious researchers and well-known scientists as well as questionable inventors and tinkerers are working to decipher this mystery. The approaches to solving the problem are inventive and fanciful, but sometimes also quirky and bizarre. Are we confronted with quackery or with hidden knowledge? Does the wondrous electric generator exist anywhere in the world? Or is it all just charlatanism? The documentary starts on a fascinating journey around the globe and through history.