Spoiler Alert: This story contains spoilers for “Blink Twice,” in theaters now.

In Zoë Kravitz’s directorial debut, paradise is not quite what it seems.

At the beginning of “Blink Twice,” roommates and cocktail waitresses Frida (Naomi Ackie) and Jess (Alia Shawkat) find themselves working at a party for Slater King, a charming, handsome, vaping billionaire tech CEO played by Channing Tatum.

Frida is enchanted by Slater, and, by the end of the night, she gets herself and Jess invited to vacation on his private island. Slater has been laying low these days, as Frida watches an interview in which he apologizes for some vague misbehavior in the past. He vows to do better, blah blah blah. It doesn’t seem to faze Frida. She’s too busy obsessing over her “anailmals,” her animal-themed fingernail art.

On the island, Frida and Jess are joined by a handful of other scantily...