Margaret was connected romantically to Harry's concealed former identity.
Harry learns that the missing singer had a wealthy fiancée named Margaret Krusemark; the later identity revelation establishes that Harry is that sing...
Ethan is Margaret's powerful Louisiana father.
The plot explicitly identifies Ethan Krusemark as Margaret's father.
Toots directs the investigation toward Margaret.
After Harry questions him, Toots refers Harry back to Margaret for further information.
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