A young museum curator Isabelle (Katie Goldfinch) is sent to look at an ancient artefact, discovered in the basement of a stately home in Shropshire. Welcomed into the sprawling manor house by a seemingly hospitable family; Karl (Larry Rew), his wife Evelyn (Babette Barat) and their beautiful daughter Scarlet (Florence Cady), but all is not what it seems, as a dark and terrifying secret hangs over them.

Four years ago, Jess and her friends lived a nightmare that has left her almost killed by the unstoppable killer 'Thorn'. Four years later, Jessica and the survivors make an attempt to stop him once and for all.

On Halloween night, a serial killer returns from the dead to take revenge on the vigilantes who put him to death one year earlier.