Peter Halliday

A beautiful assassin gets Templar involved in a plot to overthrow a South American dictator, a scheme that could cost Simon his life.

With the antidote to the plague found, the Silurians retaliate and take over the research centre. They now intend to destroy the Van Allen Belt, resulting in death for all mankind.

The Doctor and Romana become the reluctant guests of Scarlioni who is planning to steal the Mona Lisa despite having six Mona Lisas hidden in his cellar: all of them genuine.

The Indian Ocean, 1935 - or is it? The Doctor and Jo arrive on the SS Bernice, a ship due to mysteriously vanish without trace. But why do events seem to repeat themselves, and why is a plesiosaur attacking the ship? Meanwhile, on the planet Inter Minor, travelling showman Vorg arrives with his remarkable Miniscope...

Count Scarlioni is revealed to really be Scaroth, last of the Jagaroth and is funding the construction of a time machine: but for what purpose?

An injured Steed is being treated in a top secret hospital, with an assassin named Kafka, the former head of Murder International, on his trail.