At twenty-six, Dahlia Lighthouse still has a lot to learn about the world outside the island she grew up on. She was homeschooled by her parents, along with her twin brother Andy and older siblings, and their curriculum included something extra: murderers and their victims. This is so that they are prepared for the evil that may be waiting outside.

Even though Dahlia left this life of fear at nineteen, she couldn't live a normal life and spent years searching for Andy, who left home at sixteen.

Now her father has died and Dahlia returns to Blackburn after six years. He hopes to meet his twin there as well. But when they all gather at the remote family residence, they discover that someone else is already buried in the grave intended for their father...

It almost seems like Andy never really left the island…