Eye in the Labyrinth (1972)

A young woman (Rosemary Wilcox) is haunted by pop-Freudian dreams of her recently murdered psychologist (and lover), so for some reason she goes to a resort where the psychologist liked to hang out and becomes involved with a gangster (Adolf Celli) and the strange female resort owner (Alida Valli). Soon more murders occur involving the other guests at the resort.