As the various members of the Galloway family gather to depart for their annual reunion, years-long tensions and rivalries flare up, as they arrive at the private island home of patriarch Spencer. After receiving shocking news about his end-of-life plans, the group is faced with the resumption of a long-dormant round of cruel family competitions from the past.

Shocking revelations make the Galloway family competition even more difficult, as grizzly discoveries and panic grip the family, and the killer claims the first victims. Meanwhile, suspicions start to mount against one outsider following an unexpected reveal.

Reeling from witnessing a gruesome murder, the remaining Galloway family regroup to try and escape the island. But they quickly realize the competition can’t be stopped, no matter what. Seamus and Christy’s marriage tensions drive them further apart as more secrets from the past are revealed.

Paranoia and suspicion grow among the surviving group, as another body is discovered and terrible secrets from the past come to the surface.

The family devolves into more violence as both the competition and the infighting continue, leading to bloody results.

The family members dole out justice to one of their own, as The Gentleman finds an unexpected ally.

More Galloways meet a horrific end as the contest continues, and The Gentleman is finally unmasked.

With The Gentleman’s identity revealed, the surviving Galloways take matters into their own hands to finish the competition and escape the island.