The Tanguay children are strange orphans. Twenty years ago, a few weeks after the death
of their father, they were given up by their mother who fled to Spain, never to return.
To save their small sister Isabelle from this grief, they simply tell her that their mother
died. Twenty years later, it appears that their lie didn't help to make Isabelle the
most balanced member of the family. Immature and confused, the twenty-five year old seems
obsessed by delirious ideas of revenge and murder. One day she telephones her brother, Luc,
to inform him that their sister Catherine has suddenly died.