“When television networks resort to adapting books that haven’t even been written yet,” – and that’s what the Game of Thrones folks are doing at this point – “it’s time to start looking for new source material. Luckily, salvation might be as close as their smartphones. As the supply of books and comics ripe for adaptation dwindles, TV producers are looking to podcasts for fresh material – and finding stories with audiences as loyal as any book club’s inner circle.”