I sat in puzzlement for nearly the entire first half of Sam Raimi’s new movie. The IMDb had described it as a psycho-horror-thriller, but it was playing more like a romantic comedy. The two characters are: a talented but chronically unkempt employee of a small corporation (Rachel McAdams, showing unprecedented range) and the insufferable nepo-baby son (Dylan O’Brien) of the recently deceased CEO who had promised her a VP promotion.

When their corporate jet crashes in the South Pacific, they find themselves the only two survivors on a small island, and the tables are turned because, well, she watches a lot of “Survivor.” It’s actually kind of rom-com boring until one very subtle, blink-and-you’ll-miss-it moment that completely changes the dynamic. At this point, you should start looking around for a seat belt. It’s going to get messy.

Now, Raimi is a legendary, highly inventive horror director who turns out high-quality, admittedly gory slashers known for flashes of great humor. You know, The Evil Dead, Army of Darkness, Darkman and Drag Me to Hell. He also did a trio of big-budget Spider-Man movies, but it’s great to see him return to his campy roots.

Of course, saying anything more would constitute spoilers, but this is an above-average head-spinner, an exercise in delirium that constantly confounds your expectations in the most loopy, spooky and suspenseful ways. Loved the highly satisfying ending.`

(113 min)