In a run-down asylum, screams echo in the
halls as mysterious creatures roam, terrorizing the staff. Patients complain
of betrayal rather than illness, and no-one is quite what they seem.
Mel knows that the Doctor is the best person to
find the answers - but she is stranded on Earth, and the TARDIS has returned
Why does a medical facility need to be under armed
guard? What procedures are the staff carrying out, and to what purpose? What
is the price that must be paid for making an agreement with those who run the
As the answers begin to be uncovered, the Doctor
finds that the past may yet come back to haunt him...