7.4 - The Last Post

People are dying. Just a few, over a period of months... but the strange thing is that each person received a letter predicting the date and time of their death.

Throughout her time as the Doctor?s assistant, Liz Shaw has been documenting these passings.

Her investigation ultimately uncovers a threat that could lead to the end of the world, but this time Liz has someone to help her.

Her mother.

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