After a life of peril and fear, Millie has reached the peace, beauty, and security of the afterlife. But one day, when she is performing her glad duty of welcoming a new spirit, that spirit recoils from her in horror - because her body had become a zombie, and had brutally killed him.

As more spirits make the same terrible discovery, they ask themselves, and each other: is this somehow my fault? When will it end? And finally: what can we do? Is there something we can do to stop this?

And are there people among the living who can help them to do it?