The novelistation of 'Logopolis' was written by Christopher H. Bidmead.
Back Cover Blurb
Tegan stared in broad-minded Australian disbelief at the police box that had materialized in front of her eyes...
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 correting.
But fixing the mechanism involves a visit 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 Doctor's arch eney, the Master, ensures the disruption of normality. And even the Master is horrified by the threat of total chaos which he unintentionally precipitates.