Where Has Agatha Gone?

It's not every day that the vocalist of your favorite band finds you and, in horror, informs you that their drummer has disappeared without a trace! A cool detective, Clarissa Mironoff, takes on the search for the missing Agatha Novikova. She has three hours, three witnesses, and... absolutely no information! Why hasn't Agatha been in touch for several hours? Why do the members of the rock band "Black Dogrose" constantly argue and give Clarissa contradictory testimonies? And what to do when it seems there is no way out of the situation?