'Do Time Lords get Alzheimer's disease?' asked
'Oh, we get far worse things than that, Ace. The dementias that plague us are much, much darker.'
But whose life is it?
Why is the Doctor so reluctant to talk about what happened in the TARDIS? What is alien technology doing in a tumbled-down cottage? Why are cats and dogs - not to mention people - disappearing? Who is the shadowy figure stalking the Doctor and Ace - and what is the secret of the mysterious Miss Chambers who no one remembers meeting?
Soon, the Doctor and Ace find out the hard way that actions have consequences - and that there's more than one kind of dementia.