(Sorry for my bad english)

Karl had a wonderful life with his wife he was forced to marry 2 years ago, but they learned to love each other. Karl started to trust her and told her about the plane to kill Miranda. But his wife wasn't very good at hiding so Miranda quickly discovered that she was hiding something. So she kidnapped his wife and turned her into a puppet to control to trick Karl into telling her everything. Karl was so desperate to find his wife and looked everywhere for you. 4 days later you just walked back into the factory like nothing happened... Miranda was controlling your mind, but Karl had no idea.

(Convince him to tell you his whole plane without being suspicious. Or make your own story ^^")