In Montreal, the teenagers Manon, Anne, Isa, Claudie and Sophie are friends since their childhood. While spending a couple of days in the cottage of Sophie's parents nearby a lake, the girls decide to give a party, and Manon and Sophie hitch for a ride to the town in a jeep to buy some beers and supplies and they invite the driver to the party. On the return, the same driver stops the car and later Sophie is found stabbed, raped and covered of blood. Fifteen years later, Manon sees the guy in a car-wash and she invites her former friends to return to the house nearby the lake, where wounds of their traumatic loss are disclosed.

Bernard, an accountant in an upscale jewellery store, suffers from daily psychological abuse by his boss Vendôme. Thanks to his pal Robert, also victim of harassment by this cruel man, Bernard will toy with the consequence of a well-deserved retaliation at the expense of his boss. However, as not everything is perfect in this world, Bernard will also have to experience the sometimes less pleasant after effects of this ruthless act of revenge.

Suspecting that the cecassion of the tides may indicate an impending earthquake, Seismologist Alice arrives in her hometown of Baie-Comeau, Quebec to commence her investigation. Soon confronted by numerous figures from her past, the unusual weather and inexplicable behavior of the citizens lead Alice to believe that something beyond her comprehension is occurring to her old hometown...