Der Verschwundene Detektiv [The Missing Detective]

Private detective Joe Miller works a hot case in 1930s Chicago. It's about drugs, mafia and much more. But he hasn't called back for three days. There is also no trace of his secretary. His family is very worried and has asked you to check on Detective Miller. It is said that he always had his detective agency well secured, he had already made too many enemies in the past. Your task is now to find out where Miller is and who might even have kidnapped him. Surely it has something to do with one of the current cases...