Time and the Rani (novelisation)/Hardcover

In 1987, Time and the Rani was released by W.H. Allen & Co under the title Time and the Rani.

Cover Blurb
Assailed by violent bolts of multi-coloured energy, the TARDIS is blasted off-course and forced to land on the barren planet of Lakertya. The turbulence brings about the Doctor's sixth regeneration. But that is the least of his worries. He has been hijacked by that ruthless renegade Time Lady, the Rani.

Why has the Rani brought the Doctor to Lakertya? What are the hideous Tetrap guards? Who are the eleven geniuses she has imprisoned in her stronghold? What is the vital significance of the asteroid of Strange Matter? And can the Doctor stop the Rani's diabolical scheme before it affects the whole of creation throughout time and space?