Maya and Theo Whitaker are a neurotic newlywed couple from Detroit on their long-delayed honeymoon—a quirky "Around-the-World Honeymoon Package" won via a cereal box contest. On the fourth stop, the luxury cruise ship The Velvet Duchess is hosting a weeklong themed "Royal Masquerade Murder Game." The prize? A diamond-studded heirloom worth $3 million.

The problem? On the second night of the game, someone actually gets murdered.

And Maya accidentally solves the fake murder before it happens, uncovering clues not planted by the event organizers. Now she and Theo are trapped in an escalating real-world whodunnit—with masked aristocrats, a suspiciously charming prince, a fake psychic, and a boatful of eccentrics who all have something to hide.

Everyone is pretending to play along...But someone is pretending to be human.