I have a rule of thumb for any movie in a horror franchise that has the word ‘LAST’ in it’s title. That rule would be that it should be the last entry into that particular franchise. Done. Finished. Finito. Such is very much the case with Insidious: The Last Key, a desperate attempt to keep the Insidious series going with yet another prequel and even worse…..without any true scares. Let’s tiptoe into the review and get started.