Elinor's cousin with a drinking problem. He switches rooms with Lucky and is later attacked by the killer through a secret panel, mistakenly identified as the engineer.
Tennant is part of Elinor's troubled household and becomes an accidental target.
Tennant Bentley is explicitly described as Elinor Bentley's cousin and is present at the Bentley mansion.
Clarence discovers evidence of the attack and helps expose the danger at the mansion.
Clarence finds the semiconscious Tennant Bentley hidden in a trunk in the cellar.
Their shared household places both men within the mansion's suspicious family environment.
Ames Bentley and Tennant Bentley are both introduced as members of the Bentley household during the mansion visit.
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