Father Brown, an amateur detective, takes up his first case ever. He has to find the infamous criminal Flambeau. The task is however very difficult because Flambeau is a master of disguise and nobody knows what he really looks like. The detective finds out that Flambeau is planning to head out to an international conference in London, most probably intending to steal some religious articles. So Father Brown decides to cross Flambeau’s path. What the detective had not expected is a police inspector from Paris to be crossing his path. How will the three men meet? Will the criminal be caught or will the two inspectors hinder each other’s investigation? Find out in "The Blue Cross" by G. K. Chesterton.