Chaos and danger reign when good girl Miriam Webster (Patricia Breslin) meets her half brother's girl friend, Emily (Jean Arless), a mysterious blonde bombshell living at their family's Southern California estate. Emily serves as the nurse for the sibling's aging, wheelchair-using guardian, Helga Swenson (Eugenie Leontovich). She is not, however, as sweet as she seems. Emily soon reveals herself to be a murderous schemer who will stop at nothing to steal Miriam's extensive inheritance.