Kate is traveling around Ireland in an R.V. with her ex-boyfriend Ryan, brother Joel and friends Hailey , Chuck , Tommy and Anita. After driving into the countryside, the group stop off at a small shop, where they encounter Luca who attempts to scam them from buying a medallion, and warns them it is dangerous before Chuck steals the medallion and the group attempt to make a quick get-away. However, as they drive away in their R.V. they hit an old woman, who puts a curse on the group, telling them the mythical bird the roc will take vengeance on them, before dying. The group quickly drive away in their R.V. but hit a patch of thick fog and become lost, as fears of the curse heighten. Stopping the R.V. they encounter a young boy in the road. Anita leaves the R.V. to talk to the boy, but he runs away before the Roc grabs Anita and drags her into the air. Her body is dropped in front of the R.V., with half of her face mauled off before the Roc returns and flies away with her.
Ryan continues to drive down the road, as the group begin to panic as they have no way of contacting help. The Roc attacks the R.V. and causes a tire to be blown. Armed with a flare gun, Tommy goes to change the tires. As he finishes, the Roc returns. The group hear the flare gun being shot and rush outside, to find Tommy with his face mauled off. The Roc swoops down and decapitates Tommy, while the others retreat into the R.V. The group begin to argue, but the Roc reappears, chasing after the R.V., however it flies away when the R.V. reaches a secluded house. The group enter the house and find a family, including Drina (Eve Macklin), who are willing to let them use their phone. However, Luca arrives and takes them outside at gun point. Drina takes Kate to retrieve the medallion from the R.V., however Kate instead knocks her out and escapes, having already put the medallion on, while Luca ties the others to wooden poles so the roc can get them. As the Roc arrives, Kate manages to free her friends before the Roc flies away after seeing the medallion. However Luca shoots Hailey in the stomach, killing her and forcing the others to flee into the surrounding forest.
Luca chases them throughout the forest, but they manage to escape back to the R.V. where they find Drina once more, who begs for the medallion. Kate discovers the medallion is protection against the roc, so escapes with it, leaving Drina to be killed by the Roc. After driving down the road farther, the group pass a service station. Ryan leaves the R.V. after reconciling with Kate, to call for help, while the others continue to drive down the road to create a distraction. The Roc briefly follows the R.V. but soon circles around to go back for Ryan. As Ryan is about to be attacked, the others distract the roc and manage to harm it with fire. They leave the R.V. to find Ryan missing and the phone broken. They hide in a restroom before they hear a policeman, Seamus (Stephen Rea) arrive, however he begins to tie them up for the Roc, but they overpower him and knock him unconscious. While escaping, Joel is carried away by the Roc. As Kate and Chuck are leaving they run over Seamus, killing him.
After driving down the road, Kate receives a call from Ryan, however the line is cut dead. Kate manages to get a signal and phones Ryan back. Hearing the cell-phone ring, Kate rushes out into the forest only to find Luca, who shows Kate the Roc's nest, filled with her dead friends. Chuck arrives and sends Luca away at gunpoint before Kate takes the gun and sends Chuck back to the R.V. to escape, while she remains in the nest with the bodies of her friends, including Ryan, to be killed by the Roc.
Chuck, the sole survivor of the group, reaches a gas station and stops for gas, but Luca is already there and forces Chuck to give him the medallion. The Roc arrives, but Chuck manages to ignite some spilt gas, blowing up the R.V. and Luca with the Roc. The film ends with the roc having survived from the explosion and Chuck, too, falls victim to the Roc.