The Doctor re-encounters the Player known as the Countess and struggles to end her Grand Plan to allow Napoleon to win his various European campaigns. Her plan to set the City States of Europe against each other is stopped by the Doctor, despite her setting a Raston Warrior Robot and a vampire on him and Serena. In preventing the Countess's assassination scheme on Wellington, Serena is killed. The Countess has many back up plans, and at the Battle of Waterloo, her plan to prevent the Prussians coming to the English army's relief is thwarted when the Doctor imitates Napoleon himself to get through the French lines and deliver new orders to the Prussian commander Gebhard Leberecht von Blücher.
Psychic paper, introduced by Russell T Davies in the 2005 series of Doctor Who, is used here by the Second Doctor and Lady Serena, as a "new CIA invention". The text implies that the card in question is the same one later used by the Ninth, Tenth, Eleventh, Twelfth, Thirteenth and War Doctors, though the connection is never explicitly stated.
The Sixth Doctor also participates in the Battle of Waterloo in the audio The Curse of Davros when he has to prevent Davros and the Daleks from altering the outcome of the battle (although the two perspectives can be reconciled as the Sixth Doctor spends more time interacting with Napoleon in the battle while the Second was helping the Duke of Wellington).
Notes
Due to a printing error, the Doctor Who logo is missing from the spine of the book.