It’s a diverting but not particularly memorable crime movie from the nineteen thirties, and definitely among Boris Karloff’s weaker efforts; still, it holds up well enough for a viewing. **3.0/5**

Lloyd Corrigan directs Night Key, which was written by Jack Moffitt & Tristam Tupper from a story by William A. Pierce. The cast includes Boris Karloff, Jean Rogers, Warren Hull and Samuel S. Hinds, with music composed by Louis Forbes and cinematography by George Robinson. The film centers on aging inventor David Mallory (Karloff), who is once again swindled by Stephen Ranger (Hinds), a boss of a security business. W…