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Sergeant O'Brien #88
A man investigates an old tower he has passed many times but never seen illuminated before, discovering a lighted window and carefully ascending the worn stone steps to enter. Inside the locked tower, he uncovers a mystery involving a missing accomplice named Joe and becomes entangled in a dangerous situation with two men, MacGregor and his associate, who are waiting inside. O'Brien arrives to intervene, battling the criminals as Joe lies unconscious on the floor.