Ann's wealthy but frail father and a collector of rare jade. He hires Marlowe to recover a stolen necklace. At the beach house, he intervenes in the confrontation, shoots Helen, and is subsequently killed by Moose during a violent struggle.
Leuwen is Ann's father, described as weak, elderly, and wealthy.
Amthor provides healing services to Leuwen's household and associates.
Marriott rented the Grayle family's beach house, linking him to Leuwen.
Marlowe is hired to investigate jade-related matters connected to the Grayle family.
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