Instead of revealing a new companion, the third door (labeled "The Pusher") brings a new adversary to Roland: Jack Mort, a sociopath who takes sadistic pleasure in injuring and killing random strangers — and the man responsible for the head trauma that created Odetta Holmes's alternate personality, the loss of Odetta/Detta's legs, and the death of Jake Chambers.
Calvin Tower is in hiding in Maine from Enrico Balazar's men (see The Drawing of the Three), who have almost succeeded in strong-arming him into selling them the lot.
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