Lots of graphic violence, but sub-standard acting...
“Madhouse” is a 1981 slasher film about sibling rivalry. Julia (Trish Everly) is a young teacher of the deaf in Savannah, Georgia. She has spent her entire adult life trying to forget the torment she suffered at the hands of her twisted twin, Mary (Allison Biggers). At the urging of her Catholic priest uncle (Dennis Robertson), Julia visits Mary in the hospital where she’s recently been admitted with a horrific, disfiguring illness. The meeting doesn’t go well, and Mary vows to make Julia suffer as she has suffered.<br /><br />As their mutual birthday approaches, a number of Julia’s friends and neighbors begin to die gruesome deaths the house she lives in, some involving a mysterious rottweiler dog who attacks its victims, mauling them to death. Julia becomes increasingly fearful that someone — possibly Mary — is hiding inside the large house in which she lives.<br /><br />The murders constitute the film’s set pieces and are staged elaborately and graphically. Director Ovidio Assonitis is good at creating and sustaining suspense, though he fails to elicit anything but adequate performances from the cast. Better acting would go a long way in improving this grisly picture. The score by Riz Ortolani is highly atmospheric, and the vast mansion featured is yet another creepy haunted house, where danger can be lurking anywhere. The film is also known by the title “There Was a Little Girl.”<br /><br />Bonus materials on the unrated, widescreen 2-disc Blu-ray + DVD Combo Pack include alternate opening titles; brand new interviews with cast and crew; reversible sleeve featuring original and newly commissioned artwork; and a booklet containing new writing on the film.
The movie title "Madhouse (2-Disc Special Edition) [Blu-ray + DVD]," available on Movies & TV, has received an average rating of 4.5 from 81 reviewers. 
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The additional details include the following in key-value format :
 {"Genre": "Horror/Slasher Flicks", "Format": "Anamorphic, Dolby, NTSC, Widescreen", "Contributor": "Ovidio Assonitis, Michael MacRae, Trish Everly, Dennis Robertson", "Language": "English", "Runtime": "1 hour and 32 minutes", "Is Discontinued By Manufacturer": "No", "Product Dimensions": "0.7 x 7.5 x 5.4 inches; 3.77 Ounces", "Director": "Ovidio Assonitis", "Media Format": "Anamorphic, Dolby, NTSC, Widescreen", "Run time": "1 hour and 32 minutes", "Release date": "June 13, 2017", "Actors": "Trish Everly, Michael MacRae, Dennis Robertson", "Studio": "Arrow Video", "Country of Origin": "USA", "Number of discs": "2"}

Here is a brief synopsis of the title : MANY PEOPLE VISIT … NO ONE EVER LEAVES..