Much of that's down to some ferociously ingenious plotting in which the "six years earlier" device is not a glib narrative problem-solver but a wrinkle in the story that is all of a piece with it. As the last bit of the puzzle slots into place you can almost hear the film-maker's cackle of delight.
Almodovar lets his exquisite aesthetic instincts have free rein too, and as usual the distinction between style and substance is beautifully blurred. Key moments of the action (including - be warned - a graphic rape scene) are delivered as surveillance-camera images, some monstrously enlarged, but it's more than simply a visual device.
This is, as much as anything, a film about watching, and we gradually come to understand the title's hint: that skin-deep appearances can be very deceptive indeed.
This is not an easy film - in sharp contrast to the director's recent women-centred output, it's positively chilly - but it's a hell of a ride.
Stars: 4.5/5
Cast: Antonio Banderas, Elena Anaya, Marisa Paredes, Jan Cornet
Director: Pedro Almodovar
Running time: 121 mins
Rating: R16 (violence, sexual violence, sex scenes) In Spanish with English subtitles
Verdict: Outrageously entertaining
-TimeOut