Das letzte Problem

Not a film to take too seriously, since the murders in the snowbound hotel and the ensuing investigation are more on the comic than the tragic side.

Unfortunately, as in «The Mousetrap» which is one of the progenitors of this tale, one cannot discuss the identity of the murderer or their motive without a massive spoiler that would spoil future viewers' fun. Suffice to say that what has seemed trite becomes psychological, so the deliberate early banality ends with a nice twist of complexity.

And the German title gives us a tiny clue, as it is pretty sure to be the detective's last case (though, as with the Reichenbach Falls, one must never rule out resurrection!)