Traumatized by the experience, she suffered a mental breakdown, did not speak a word for two years, and was entered in a Swiss sanatorium.
Upon leaving the psychiatric institution for the first time, she returns to her old home where her mother, Miriam, is now in an unstable marriage with Harold Jennings, an alcoholic.
One night, Susan sees a shadow by her window, then finds a dead man in her bathtub.
On a different night, Susan is chased out of the mansion by someone she thinks is Harold, and outside finds a dead body in the car.
She turns to John, an old family friend and the gardener - for help, only to find the car is missing when she returns.
It is then revealed that Miriam has been conspiring with John to subvert Susan's recovery, in order to disinherit her from her father's will.