The Murderer Is a Fox
What does Ellery Queen determine is the only way he can help Davy in the novel, The Murderer Is a Fox?
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Ellery Queen determines that the only way to help Davy is to reopen his mother's murder case, hoping to prove that Davy's father was not responsible for her death, and by extension that Davy is not the son of a murderer.
The Murderer Is a Fox