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The plot of Silent Sentinel is motivated by the villain, an outwardly respectable banker. Heading a clever gang of thieves, the banker is careful to have those in his employ do all the dirty work. Framed for one of the banker's recent heists, a cashier tries to prove his innocence, aided by his faithful girlfriend. But it is the girl's pet hound, trained as a police dog, who exposes the banker as a crook. Described as "insipid" and "dull" even by the most charitable of film critics, The Silent Sentinel seemed to have been written on the back of a grocery list and filmed by mistake.