Ruthless executive Christine (Kristen Scott Thomas) takes delight in toying with the innocence of her assistant, Isabelle (Ludivine Sagnier), passing her young protégé's ideas on as her own. Confident of her control over Isabelle, Christine leads her into a confusing, perverse game of seduction and domination but ultimately underestimates Isabelle's ambition and cunning leading to an all-out boardroom battle with deadly consequences.