As she does every morning, Lucie takes advantage of her journey to work to lose herself for a while in the pages of a good book. And as she does every morning, she joins her colleagues at the office with a smile. It's a working day just like any other. Then suddenly all activity in the office stops. All attention is turned towards the window of the opposite building opposite and abanner reading: Man Alone. Is it a hoax? A cry for help? Everyone has his own interpretation, and will try, by any means possible, to discover what lies behind this mysterious message.