Blackie and the Runt fill in as party security as a favor to the widow of their recently killed friend. Not surprisingly, a valuable necklace is stolen; it's not the first time that helping a friend has gotten them into trouble. Also not surprisingly, Inspector Farraday is on the case—and pins the job on Blackie the moment he sees through the Runt's swami disguise. (They were doing the job undercover and in costume.)
From there on, Trapped by Boston Blackie is unpredictable if not surprising—the plot involves a ballet instructor, his student, a secretary, the necklace's owner, and said owner's niece and husband. Lots of characters to keep straight! Indeed, it takes Blackie (with Farraday in pursuit, naturally) the length of the picture to sort them all out, restore order along with the necklace, and once again prove his own innocence to the inspector.
Sidekicks Runt and Sergeant Matthews are along as always; neither is quite so dumb as usual in this entry, although Farraday is driven to deliver his trademark exasperated shout ("Matthews!") more than once.
Plenty of disguises for Blackie and the Runt in this one—their turn as an elderly couple has to be one of their best ever, with the Runt quite hilariously convincing as "Mother." (Blackie even teases "her" about walking past the police wearing a borrowed wrap: "You think the boys are gonna notice an old hag like you? Now get your bonnet." To which the Runt snaps, "Well, I like that!" in perfect insulted-mature-lady style.)
The plot here is thicker than some films in the Boston Blackie series; the humor is (mostly) less physical and lower key. –That said, however, it's still a Blackie picture: light and enjoyable, a fast-moving 67 minutes that will relax and amuse more than confuse or confound. Blackie fans will want to catch it at least once.
