Catherine is about to drive herself to a bridge tournament when Diane's father, Charles, asks her for a ride to town. Instead of moving forward as expected, the vehicle speeds in reverse, crashing through a guardrail. It careens down a steep cliff, killing them both. As Diane is now the sole heir, she comes under suspicion for murder; police arrest her and Frank as well. Diane is genuinely devastated, as she never intended her beloved father to be in the car, and she is admitted to a hospital for treatment. She confesses that she planned and executed Catherine's murder. Doctors believe she is delirious.