Rachel and Dan - in love, expecting their first baby and also mourning the sudden death of a close friend - want to go somewhere hot in January. When Dan produces a ring and tells her he's already booked a luxurious resort on Antigua, the holiday turns into a honeymoon. Rachel's experience of the island soon turns from idyllic to disturbing. As furniture shifts and objects fly around, a waitress begs her to leave, and as a fellow guest starts to frighten her, Rachel realises that something sinister is going on. When the waitress is found dead, Rachel realises her only hope it to persuade Dan they should go. But Dan seems to have his own reasons for wanting to stay, and soon Rachel is unable to decide who - or what - she should be most afraid of.