Released one year prior to the atmospheric, surreal horror classic “Carnival of Souls,” “Night Tide” is a similarly bizarre film that radiates an odd effect. Johnny (a young Dennis Hopper) falls in love with Mora (Linda Lawson), a sideshow performer who might also be a mermaid with a penchant for murdering her lovers. The performances are adequate and realistic, with Hopper conveying a proper balance of lovestruck awe and confusion; Lawson is fittingly remote and enigmatic. Writer-director Curtis Harrington builds a fair amount of suspense and limits the action to several effective dream sequences, thereby retaining a surreal mood. Not as wild as Jack Hill’s “Spider Baby,” nor as subtly brilliant as “Carnival of Souls,” “Night Tide” is a diverting in-between that’s worth a look.