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.

Still reeling from Birgit’s confession, Vincent takes his anger out on a panicked Liv, who searches for her missing mother with Theo. With Florence still focused on Vincent, O’Keefe looks for maternal comfort from Grace. The next contest for the family brings new allegiances and stunning betrayals, as Florence makes a horrific sacrifice to save her own skin.

After discovering Florence’s selfish crime, Theo takes matters into his own hands in dealing with his wicked mother. Christy learns more about Aphra’s past, with grisly results.

Despite their shared penchant for bloodshed, The Gentleman doesn’t spare Aphra from a gory death. Leaving only Grace, Theo, Vincent, and Liv in the competition, Grace finds herself outnumbered and fights to continue the competition, leading to another elimination and the unmasking of The Gentleman.

After revealing The Gentleman’s true identity, Theo, Vincent, and Liv face horrific truths about the competition and their family, and the heir to the Galloway fortune claims their prize.

The city's elite are thrown into panic when a member of the upper crust is murdered by a killer dubbed "the Widow." Detective Rijkers is put on the case. The city's most powerful man, Basil Garvey, is a target and works to control the investigation.

The Widow strikes again, and Kenneth Rijkers begins connecting the killings to a 12-year-old mystery, while Basil Garvey, a business oligarch, pulls a number of strings to control the investigation.

Enid's newspaper declares another Widow murder; panic rises, and Kashtinsky gets high to keep focused; Eddie tries to flee, but Basil reminds him that he owns him; Kenneth uncovers proof that links the victims to the killing of Margaret Mehar.

The Widow sends a nasty treat to Basil and friends, which sends Kashtinsky over the edge; the Botticelli sisters arrange for Verdi to have their portraits taken; Georges Rondeau, the prime suspect in the murders, preys on Regina.

The Widow's latest victim is found on Valentine's Day, dragged to death behind a horse and made up to look like Cupid; a torn piece of the Widow's weeds sends Kenneth and Regina off on a hunt; Salomé entertains bidders for Verdi.

The pressure gets to Israel, who admits to her and seven other involvements in Margaret's death; Kenneth secures the suspects, freeing only Israel to operate on a friend of Regina's - inadvertently putting her into the Widow's clutches.

With Kenneth's list of suspects either jailed or buried, he sets his sights on the sly magician Georges, who is slowly losing his grip on reality.

With the Widow's final victim nearly in her clutches, Kenneth's time is running out; however, upon revealing the killer's identity he grapples with how to bring justice to the victims.

Misinterpreted evidence points everyone in a false direction, while one camper finds evidence that makes him question the motive behind the slaughter.

With the identity of the Druid revealed, the few remaining survivors inside the apartment building must make a last-ditch fight for their lives.

The histories of several characters unfold in flashback, revealing surprising connections, while an innocent hiker is pulled into the unfolding drama.

The serial killer confesses to another camper, but the rest of the stranded survivors are still in the dark as final twists and truths are divulged.

After a body is found and a guest vanishes, both groups discover they're trapped at the camp with communication to the outside world cut off.

Sarah finds herself at the center of a series of copycat killings and visits the man who murdered her parents in prison and he imparts a cryptic message.

As the list of victims continues to grow, the number of possible suspects narrows and the two groups are forced to cooperate despite mutual suspicion.

Desperate to discover the identity of the killer preying on them, the remaining survivors reluctantly conduct a mock hearing to learn the truth.

Connections to Kit are revealed in flashbacks, while a couple's secret affair is exposed via social media and another slaying strikes the community.