Doctor who- logopolis (4th doctor target publication)

For as long as anyone can remember the chameleon circuit of THE TARDIS has been broken- a minor inconvenience which the doctor now finally gets around to correcting.

But fixing the mechanism involves a vist to earth and to the planet Logopolis-a quiet little place that keeps itself to itself.
But on this occasion the meddling presence of the doctors arch enemy, the master, ensures the disruption of normality. And even the master is horrified by the threat of total chaos which he unintentionally precipitates.

Logopolis was the final story to feature the forth doctor, as played by tom baker.
This is a novelisation by Christiphor H. Bidmead of his own original script.