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Future "Hopalong Cassidy" William Boyd essays the title role in Pathe's The Cop. It all begins when likeable police sergeant Alan Hale Sr. is bumped off by surly scar-faced underground chieftain Robert Armstrong. Unfortunately, the authorities aren't able to pin the crime on Armstrong, so patrolman Boyd takes it upon himself to trap the killer. He is aided in this endeavor by "mystery woman" Jacqueline Logan, who may or may not be working both sides of the fence. Coincidentally, Quality Productions' The Lookout Girl, featuring Jacqueline Logan in a similar role, premiered two weeks before The Cop.