After witnessing a shocking death, Abby and the rest of the group head out to find the killer. Meanwhile, Shea and Madison find out that one of the people they know has a criminal record, and someone else goes missing. Five people’s lives are taken.

An attempt to leave the island turns into a disaster that will keep the remaining members of the wedding trapped for now. Meanwhile they find out a secret that will leave them reeling, and four more victims are claimed.

The remaining members of the wedding party begin to turn on one another. Things go from bad to worse after finding an underground tunnel system, and discovering the dark secrets that lurk within as two more victims die.

After a wedding guest is kidnapped, people enter a race against time to find her. Meanwhile, four people try to escape from the island after they have been told that the kidnapped victim will be killed if anyone leaves. Meanwhile, three more victims die.

After Abby, J.D., and Henry try to solve the mystery by looking in the the sheriff’s attic, the guests begin to think that they know who is responsible for all of the killings. Meanwhile, a tenth victim bites the dust.

After a horrific murder scene at the wedding rehearsal, the island and the guests are put on lockdown. People start wondering if the killer is among them. Meanwhile the ninth victim is killed.

Abby discovers her father’s secret obsession, meanwhile an innocent wedding rehearsal ends in another gruesome and terrifying death.

The groomsmen take Henry fishing for his bachelor party and make a gruesome discovery. The bridesmaids celebrate Trish’s final days as a bachelorette with a psychic who has a very strong reaction to Abby, and a different sort of death is witnessed in this episode.

When someone’s body is found in a house, people wonder if it is suicide or if someone killed her.

A mysterious scavenger hunt leads to three unknown deaths on Harper’s Island.