In March 1973, a pair of British tourists are attacked while camping in the South of France. Jeremy Cartland is injured, but his father, John Cartland, is brutally hacked to death. It is not the first time French police have to work with the detectives at Scotland Yard, but the case highlights how differently the two forces investigate homicide. Scotland Yard are meticulous in their record-keeping, interviewing processes and evidence logging. The French are not. The result is a catalogue of errors, leaving police on both sides of the pond with a handful of solid suspicions, a number of conspiracy theories, and no concrete evidence to catch their killer.

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