Led by Kim Philby, Plan Aurora is a plan that breaches the top-secret Fourth Protocol and turns the fears that shaped it into a living nightmare. A crack Soviet agent, placed under cover in a quiet English country town, begins to assemble a nuclear bomb, whilst an MI5 agent attempts to prevent it's detonation.
Sir Robert Norberton stakes a huge amount (much of it borrrowed) on his horse Shoscombe Prince winning a race. His trainer thinks Sir Robert has gone mad and consults Holmes. Then one of the many creditors disappears and human bone is found in a furnace...