Trevor, an insomniac lathe operator, experiences unusual occurrences at work and home. A strange man follows him everywhere, but no one else seems to notice him.
Four prison inmates have been hatching a plan to literally dig out of jail when another prisoner, Claude Gaspard, is moved into their cell. They take a risk and share their plan with the newcomer. Over the course of three days, the prisoners and friends break through the concrete floor using a bed post and begin to make their way through the sewer system -- yet their escape is anything but assured.
On a winter day in 1961, 31-year-old Anna Eichmayr crosses the Grosshesseloher bridge in Munich, she suddenly stops in the middle of the bridge, opens a manhole and plunges into the depths. The film traces the young woman's life in flashbacks. It goes back to 1945.
In the past few days Rome has been the scene of a singular event: when it rains, the manholes exhale a dense steam whose origin and composition is unknown. No one can imagine that whoever breathes in the mysterious substance will have to deal with what he/she represses, their darkest instincts, their anger. Not even the Morel family.