From the liner notes

Brace yourself for four times the terror! During a power failure, murderous psychopaths break out of a mental institution and lay siege to their doctor's house in Alone in the Dark, one of the most terrifying and memorable cult films of the 1980s. The chilling Afraid of the Dark follows a psychic boy troubled by a razor-toting slasher who preys on defenseless blind women. Detective Sam Dietz pursues a savagely cunning serial killer who carves up young women and taunts police by mailing them pieces of his handiwork in Relentless 3. Then Dietz returns in Relentless 4, hot on the trail of a bloodthirsty murderer with a passion for ritualistic executions.