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Currently you are able to watch "The Grotto" streaming on Tubi TV for free with ads or buy it as download on Apple TV. It is also possible to rent "The Grotto" on Apple TV online
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Carlo and Melissa stay at a seaside villa but everything changes when Melissa discovers an ancient book of demons and the ghost of a 10 year old boy that's been dead for 40 years. She becomes possessed and it's up to Carlo, with the help of Anna De Luca, a professor on demonology, to stop the ritual that will bring about the rebirth of a 400 year old demon.