Low-budget but memorable would-be shocker that instead emerges as theater of the bizarre. Vulnerable, naive nurse Charlotte Beale comes to a secluded mental hospital and is completely unaware that the only sane people have been murdered, despite the red flags that are constantly being raised all around her.
The lack of a decent budget really gives the filmmakers little more to go on than a sense of style, as well as a cast of wacky characters. The pleasures of this film don't come from the film's shocks, which are fairly tame, but from the weird atmosphere. First we have the delusional woman who thinks her baby doll is real. There's also an axe-murdering judge, a shell-shocked war veteran, and old Mrs. Callahan is like everybody's daffy elderly grandmother gone amok. A young patient named Allyson gives the term "nymphomaniac" new meaning. A big guy named Sam is just a little slow after a botched lobotomy, and Jennifer vaults suddenly between catatonia and violent outbursts. The only other sentient person in the place seems to be Dr. Masters, but does she have a secret?
"Don't Look in the Basement" is a great example of low-budget exploitation films. There isn't much plot going on, but the cheapness works for the movie. Several cast members turn in memorable performances, particularly Betty Chandler and Annabelle Weenick, and the way the director adds little weird details to the movie can really stick with you.
The scene between Allyson and "the telephone man" is a classic for all time, and especially delicious are the facial expressions of Dr. Masters when she begins to go over the edge near the finale of the movie. Brownrigg also makes great use of the cheap soundtrack, with several musical cues really evoking the characters that they accompany. My favorite cue is the "crazy" cue, a sitar that twangs whenever one of the patients does something pathological.
Also wonderful is the way that Charlotte herself plunges into hysteria at the climax, with the patients revealing that Dr. Masters is simply another inmate, and then suggesting that CHARLOTTE is also a patient who is being allowed to act out her delusions (she certainly has a tenuous grip on reality, why else would she not question the ominous lack of phone service or outside contact?). The scene where Charlotte manages to finish off the barely-alive Dr. Stephens with a toy boat has to be one of the greatest moments in low-budget horror. Yes, "Don't Look in the Basement" could very well be the "American Beauty" of Grade Z trash.