Perhaps the most interesting aspect of the “Insidious” series is watching how writer Leigh Whannell manages to squeeze out new directions for the saga to take after exhausting all his ideas in the 2010 original film. After going the prequel route for “Insidious: Chapter 3,” Whannell makes a sequel to the prequel with “Insidious: The Last Key,” which is meant to lay track up to the first movie, creating a crooked circle of character connection for a franchise that never had a decent road map to bring it through various installments. “The Last Key” promises finality for the brand name, but endeavors to squeeze out a few more scares using the proven fright formula that turned the three previous pictures into low-budget hits. Whannell is out of ideas, but he goes soft for the new journey into the Further, giving a fan-favorite character the spotlight she deserves. Read the rest at Blu-ray.com

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