Pyne goes to the Bon Voyageur restaurant and meets a Mr Bonnington there. The previous evening, an absent-minded professor called Petersfield was murdered in an attempt to steal some secret plans from him. Fortunately, the plans were not taken but they have got to be sent safely to the League of Nations in Geneva. Their usual agents to carry out this task are either indisposed or, in the case of one by the name of Hooper, are not trusted as he is suspected of being a double agent. Pyne knows of someone who could take on the case...