TV journalist Melanie Black wakes up one morning next to a man she doesn't remember. It's not the first time - but he ignores her even though she's in his bed. Yet when his wife walks in with a cup of tea he greets her with a smile and to her horror, Melanie comes to realise that no one can see or hear her - because she is dead.

But has she woken up next to her murderer? And where is her body? Why is she an invisible and uninvited guest in a house she can't leave; is she tied to this man forever? Is Melanie being punished in some way, or being given a chance to make amends?

As she begins to piece together the last days of her life and circumstances leading up to her own death it becomes clear she has to make a choice: bring her killer to justice, or wreak her own punishment on the man who murdered her.