Doctor Who: City of Death City of Death

The Doctor takes Romana for a holiday in Paris - a city which, like a fine wine, has a bouquet all its own. Especially if you visit during one of the vintage years. But the TARDIS takes them to 1979, a table-wine year, a year whose vintage is soured by cracks - not in their wine glasses but in the very fabric of time itself.
Soon the Time Lords are embroiled in an audacious alien scheme which encompasses home-made time machines, the theft of the Mona Lisa, the resurrection of the much-feared Jagaroth race, and the beginning (and quite possibly the end) of all life on Earth.
Aided by British private detective Duggan, whose speciality is thumping people, the Doctor and Romana must thwart the machinations of the suave, mysterious Count Scarlioni - all twelve of him - if the human race has any chance of survival.
But then, the Doctor's holidays tend to turn out a bit like this.
Featuring the Fourth Doctor as played by Tom Baker, City of Death is a novel by James Goss based on the 1979 Doctor Who story written by Douglas Adams under the pen-name David Agnew. City of Death is one of the best-loved serials in the show's 50-year history and was watched by over 16 million viewers when first broadcast.