Doctor Who and The Three Doctors by Terrance Dicks, Paperback

Like new. No markings. No creases. Pages have light tanning.

A mysterious black hole is draining away power from the Universe. Even the Time Lords are threatened. The Doctor is also in trouble. Creatures from the black hole besiege UNIT Headquarters. The only person who can help the Doctor is... himself.

The Time Lords bring together the first three incarnations of the Doctor to discover the truth about the black hole and stop the energy drain.