Following a medical expert's advice, Montagu procures the body of a man who died of pneumonia so it appears he drowned. After proper preparations, the corpse is placed in a canister packed with dry ice and transferred to a waiting submarine. The body is released in the Mediterranean where it washes ashore on a Spanish beach. The local authorities, observed by German and British consulate staff, process the body. After the attaché case containing the letters is returned to London, a forensics expert confirms the key letter, describing the (false) Allied invasion in Greece, was cleverly opened, photographed, and resealed.