Much like the Saw franchise, the Insidious films look backwards as eagerly as they move forwards, folding in on themselves to bring dead characters back time after time. This is hardly surprising, as both series were created by Australian filmmakers Leigh Whannell and James Wan.
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Review, South China Morning Post
Insidious: The Last Key

SPENCER LOCKE as Melissa Rainier in Insidious: The Last Key. The creative minds behind the hit Insidious trilogy return for the supernatural thriller, which welcomes back franchise standout Lin Shaye as Dr. Elise Rainier. In the film, the brilliant parapsychologist faces her most fearsome and personal haunting yet: in her own family home.