A theatre usher who initially provides vague descriptions of a suspect. He is revealed to be the true killer, murdering Köpernick and Mervyn to stop the play's adaptation due to exploitation of his brother's tragic death. He orchestrates the final confrontation at Christie's home before being killed by Agatha.
Stalker directly confronts the primary antagonist.
Dennis murders Köpernick to protect his brother's legacy.
Dennis sees Woolf as a key figure in the exploitation.
Dennis holds Spencer hostage during his final plan.
Dennis captures Attenborough as part of his trap.
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