I think that _Insidious_ might genuinely be a franchise best watched in the story's chronological order, rather than the movies' release dates. I can't be certain though, because I'd have to re-watch them all to make sure I'm not making a bad recommendation, and I'm not super keen on doing that seeing as this one and the one preceding it were both kinda... bad. The mythology of _Insidious_ is something I am very interested in, and _The Last Key_ added it to it **somewhat**. But if this is the sort of quality we can expect from future instalments, then maybe we should never see the resolution…