The setting is a quiet town where a solitary woman (Ida Lupino) brings in a handyman (Robert Ryan) to care for her home. She quickly finds herself wishing she hadn’t, as Ryan's behavior becomes increasingly unstable; it seems she’s taken in someone struggling with schizophrenia and now feels trapped within her own house. Beware, My Lovely is based on Mel Dinelli's story and play, "The Man," and the movie takes place almost entirely in one location, centering around just two characters. The film delivers solid performances from both leads and presents a unique perspective on mental illness. However, it’s not a relentlessly suspenseful or violent experience; it isn’t that kind of thriller. From early on, it's apparent that Ryan’s Howard Wilton is a man with serious problems, but the danger here comes in a different form, offering an alternative look at psychosis and making it hard to completely dislike the unsettling main character. Ryan and Lupino work well together; they previously starred in the excellent film On Dangerous Ground earlier in the same year. Their comfort level with each other allows for a carefully developed story that unfolds entirely within the confines of a single house, which feels like a prison. Ryan is especially effective as his character shifts between moments of lucidity and episodes of madness—some scenes are genuinely frightening, while others evoke considerable empathy. Director Harry Horner’s work is understated (he mostly lets the actors carry the weight), and George E. Diskant's cinematography includes some clever and striking visual elements—one involving Christmas ornaments stands out in particular. The film lands somewhere between being merely decent and truly exceptional, but it has enough merit to warrant a recommendation for those who enjoy accessible and somewhat unusual film noir. For admirers of Robert Ryan, though, this is practically required viewing. 7/10

Source on TMDB