A flustered man gives a young woman some papers. Then the Lusitania sinks, and the young woman disappears. The result is a chain of events that could topple the very government.

Meanwhile, Tommy and Tuppence, dear old friends, get to comparing notes. They find that neither one has two coppers to rub together, even if they wanted to. They form the company of Young Adventurers, LTD, and adventure comes knocking.

With a bevy of colorful banter along the way, Tommy and Tuppence tackle a colorful cadre of villains, spies, and murderers with punchy British pluck.