Not really a potboiler, but not a chiller either!
Pregnant pauses, sidelong glances, mute conversations, and a slowly paced narrative do not necessarily create tension and suspense. Just because Hitchcock could do it, doesn't make it easy! This film was riddled with inconsistencies, bad and hackneyed dialogue and lousy turns of phrase, and Radcliffe was obviously floundering out of his depth (no wizardry here!), which, considering that the story required a lynchpin performance, was rather a hindrance to the whole assemblage, and turned it into a somewhat farcical, cliché-ridden, mare's nest of a movie... As for the ending, the least said about that, the better...
I've seen things you people wouldn't believe...