As history plunges onwards inexorably, the Doctor's companions realise that history books can lie. But the Doctor can see the threads that hold all time together - can he and his companions escape the depravities of the decadent Russia without unravelling the history of Earth?

(This book is the first purely historical adventure for the Third Doctor, played on TV by Jon Pertwee. A gritty, well-researched drama with no science-fiction elements beyond the time travellers themselves.)