The Saint Meets the Tiger" was the first of the Saint books, but appeared rather late in the series of movies. The Saint is following the trail of a million pounds sterling of gold stolen from a Bristol bank by a gang headed by "the Tiger", a criminal mastermind. Hugh Sinclair, who doesn't much look the part initially, grows on you as the Saint with his witty and confident performance. His sidekick, Horace, has been transformed from a rough retired seaman to a dapper butler. The story isn't, of course, exactly the plot of the book, but it is close enough to give you fond reminiscences of the book. The cast is very similar in most respects to the main characters in the book. One of the main differences is that the identity of the Tiger is revealed quite early in the movie, and that revelation is virtually the last event in the book.
Some of the action scenes are a bit simplistic, to the point of virtually being bungled. Yet the charm of the dialog and the heroes overcomes those deficiencies. If you like these classic old mysteries, you can do a lot worse than "The Saint Meets the Tiger".