Дюссельдорфский убийца (Dusseldorf Killer) is an Android application developed by Publish Digital Books that presents a thriller based on the real events that took place in Germany during the late 1920s. The book revolves around the crimes of a maniac who admitted to 69 murders. The killer was sentenced to nine executions by guillotine, which shocked the judge handling the case. The book cover and application icon feature the photo of Peter Kurten, whose crimes inspired the thriller.

The application is user-friendly and offers a simple menu to adjust the book display according to the user's device specifications. The Digital Books publishing house is dedicated to promoting classic literature and supporting new authors. The publisher has released over 300 books in the form of Android applications, which are small in size and do not affect the performance of smartphones or tablets. The application does not send SMS to premium numbers or collect personal information from users.