Like last year’s When The Bough Breaks, the new female-focused psycho-stalker thriller Unforgettable seeks to occupy that sweet spot between Fatal Attraction and the Lifetime Movie Network. Unlike that earlier film, though, Unforgettable goes for an R rating, allowing it to fully embrace the “erotic” in erotic thriller. So how did it end up being so, well, forgettable, right up until its howlingly campy climax?

The answer may lie in the film’s awkwardly self-conscious characterization of Julia (Rosario Dawson), an editor for an ill-defined storytelling website called Chapter Pad. It seems to be some sort of crowd-sourced publishing platform, but it’s hard to tell, as Julia never really does any work. She moves from San Francisco to Southern California to be with her stubbly fiancé, David (Geoff Stults), who obviously owns a craft brewery. (Potboiler thrillers rival romantic comedies in the preciousness of their protagonists’ occupations.) Julia...