Juliet McKoen's debut as writer-director, Frozen, is a mystical thriller set in Fleetwood and the awesome stretches of Morecambe Bay at low tide. Shirley Henderson plays a disturbed fish processor investigating the disappearance of her sister, last seen on CCTV. Like David Hemmings in Blow Up, she's obsessed with an image. Like Donald Sutherland in Don't Look Now, she keeps seeing a figure dressed in red always just out of distance. It's a visually striking film of some promise.