Context:

Tom describes meeting Gordon Corera (BBC security correspondent) at a carol service, where Corera mentioned he'd written a book about the role played by pigeons in the First and Second World War. This led to a podcast episode on pigeons that Tom considers one of the year's highlights, noting that listeners initially didn't believe they were serious about the topic.

Context:

Tom mentions that Gordon Carrera told him about this book he had written about the untold story of World War II resistance in Europe involving pigeons. This is the main book discussed in the episode.