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On a very ordinary day, Harriet Westaway receives a strange letter saying that her grandmother has left her a generous inheritance. However, Hal realises that there has been a mistake: her grandparents are long dead and she has no other relatives. Hal buried her mother three years ago. Now the girl lives in poverty: she reads tarot cards and dreams of finally paying all her bills. Exhausted, in debt, and desperate, Hal decides to take a chance and finds herself at Trepassen Manor, where the Westaway family has gathered to honour the deceased and divide the inheritance. But soon Hal realises that this family is hiding a long-standing secret... Is it worth fighting for the inheritance and searching for the truth if it seems more terrifying than the worst nightmare?