The team must decide whether an apparent suicide at a retirement home was in fact murder. Meanwhile, Humphrey's wife makes an unexpected visit.
With four werewolves in the house, Mitchell is feeling the pressure. However, does one of the nomadic wolves have an ancient score to settle? Meanwhile the police begin to close in.
The Doctor and Donna land in a frightening position in the far future. While investigating a derelict library, the duo come face to face with the disembodied mind of a little girl, an archaeological team led by a woman from the Doctor's future, and swarms of flesh-eating creatures that are seen only as shadows. Surrounded by every book ever written, the Doctor takes control to keep everyone alive and in the light. But the darkness is moving too fast for him, and the key to their survival could be in the nightmares of a little girl...moreless