Five young adults venture into a bog to excavate some bodies. After a while they find that bodies that have been buried in the bog have risen from the dead and seek to pick them off one by one.

Though Rachel (Ginnifer Goodwin) is a successful attorney and a loyal, generous friend, she is still single. After one drink too many at her 30th-birthday celebration, Rachel unexpectedly falls into bed with her longtime crush, Dex — who happens to be engaged to her best friend, Darcy (Kate Hudson). Ramifications of the liaison threaten to destroy the women’s lifelong friendship, while Ethan (John Krasinski), Rachel’s confidant, harbors a potentially explosive secret of his own.