Although Terror by Night is not the best of the Universal Sherlock Holmes films, it does feature one of the more convoluted plots in the series; indeed, whereas many of the other entries concentrate on action or step-by-step plots that progress in a logical fashion, Terror is essentially concerned with keeping viewers guessing as to the identity of the jewel thief and in keeping them off guard as it does so. It does this rather well, even if it "cheats" a bit by not always providing sufficient information -- and director Roy William Neill does an excellent job of capturing small moments, grimaces, and gestures that manage to manipulate the audience's suspicions very nicely. And, of course, Basil Rathbone continues to be in tiptop form as Holmes, with the usual solid support from Nigel Bruce's amusingly befuddled Watson and a very capable supporting cast. Indeed, Terror's only real flaw is that it has comes so late in the series that a slight bit of ennui has set in; there's a tinge of "been there, done that," nothing so overt that it derails Terror, but just enough to dampen its effectiveness slightly.