Book I of Tommy and Tuppence.  A top secret document mysteriously disappears after the sinking of the Lusitania. Some years later, two naive young Britons, Tommy and Tuppence, form a partnership for adventures and hard cash and find themselves on the track of a political time bomb – the mysterious document. From then on they are under the eye of the elusive, ruthless Mr. Brown, anonymous leader of the most dangerous political cadre ever known. As the pair get closer to their goal, he draws a net of kidnapping, espionage and murder ever tighter around them…