Man's Best Friend. Obsession (AKA: The Hidden Room) is directed by Edward Dmytryk and adapted to screenplay by Alec Coppel from his own book and play. It stars Robert Newton, Phil Brown, Sally Gray and Naunton Wayne. Music is by Nino Rota and cinematography by C.M. Pennington-Richards. Finally having had enough of his wife's affair with a young lover, Dr. Clive Riordan (Newton) plots a devilish scheme of kidnap and murder... The motive that drives the plot of Obsession is simple in the extreme, this is out and out a revenge for infidelity, but the presentation by Dmytryk is superbly ...