Summary
Collecting his post in the London of 2012, the Doctor and Ace are called through time to south-east Scotland to help out an old friend -- an old friend who’s vanished. They find themselves at Graystairs, an Alzheimer’s treatment clinic and a place of healing, where the patients seem to be gaining a new lease of life. But whose life is it?
Why is the Doctor so reluctant to reveal what happened in the TARDIS before their arrival? 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, whom 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.