Blood Frenzy (1987)

Synopsis
An unorthodox psychiatrist transports six of her most disturbed patients to a remote desert location for a few days of aggressive group therapy. This leads to lengthy scenes of hammy soul-searching and tedious psycho-babble, until the one of their number disables the group's van and begins picking the others off one by one, triggering a frantic whodunit scenario. If one can get past the initial loopy premise, there are enough twists and scares to keep less-discriminating viewers interested (provided they can stomach the numerous gore scenes); jaded horror fans need not apply, however, since they will surely detect parallels to the slightly superior psycho-thriller Schizoid and figure things out far ahead of the goofy "surprise" climax. ~ Cavett Binion, All Movie Guide