I Walked with a Zombie / The Seventh VictimTerror lives in the shadows in a pair of mesmerizingly moody horror milestones conjured from the imagination of Val Lewton, the visionary producer auteur who turned our fears of the unseen and the unknown into haunting excursions into existential dread. As head of RKOs B horror movie unit during the 1940s, Lewton, working with directors such as Jacques Tourneur and Mark Robson, brought a new sophistication to the genre by wringing chills not from