The "problem" of Gibraltar has been a constant source of diplomatic tension between Britain and Spain for more than 300 years. Franco himself described the Rock as a "dagger in the spine of Spain," and it was during his dictatorship that Spain's diplomatic campaign to recover Gibraltar reached its height with the closing of the frontier in 1969. Given this background, it has long been assumed by historians and commentators that relations between Gibraltar and its Spanish neighbor have also been strained. Gareth Stockey rejects this assumption, and demonstrates that relations across the...