Watch Insidious: The Last Key (2018) HD Full Movie Free on SolarMovie. Watch Insidious: The Last Key (2018) online free. Parapsychologist Dr. Elise Rainier faces her most fearsome and personal haunting yet, as she is draw...Parapsychologist Dr. Elise Rainier faces her most fearsome and personal haunting yet, as she is drawn back to her ghostly childhood home where the terror began.