Racecar driver with a declining personal and professional life. Invited by Constance to stay at her estate, she bonds with Constance and joins her in plotting to murder Maurice. She later helps dispose of Constance's body at sea.
Former marital bond that drives the initial invitation and underlying tension.
Strategic partnership formed through shared resentment and a lethal goal.
Adversarial dynamic where Susan's suspicion directly threatens Helen's safety.
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