The anxious young woman, Rachel, is hesitant to have a typical bachelorette party, but her friends insist on taking her to a cabin in the woods for a weekend of relaxation and fun. However, tensions rise when they discover that their cabin is next to an active crime scene, and Rachel becomes convinced that someone is following them.
As the night progresses, the friends begin to turn on each other and various secrets are revealed. Then, a masked killer enters the cabin and starts picking off the wedding party. The group tries to fight back but find themselves hopelessly outmatched.
Rachel eventually discovers that the killer is actually her ex-fiance, who was bitter about their breakup and jealous of her upcoming marriage. In a final showdown, Rachel faces off against her ex and manages to take him down, but not before losing several of her closest friends.
The movie is a slasher horror with plenty of gore, jump scares, and suspenseful moments. It also touches on themes of friendship, trust, and the sometimes-devastating consequences of past relationships.