Poison (movie, 2001)

In the vein of "The Hand That Rocks the Cradle" and fraught with mystery and edge-of-your seat suspense, Kari Wuhrer Poison tells the darkly insidious story of the Garrett household and their descent into a hellish world of sexual malice and physical terror! Seeking revenge for her husband's death, Ann ingratiates herself with the Garretts under the guise of a caring housekeeper. Once she gains their trust, Ann begins to wreak havoc upon them. Seduction and malice are her weapons as she attempts to eliminate everyone she believes is responsible.