@book { FinsteresGrab,
    title = "Finsteres Grab",
    subtitle = "Thriller: Wales Killings 1 | Ein Serienkiller mordet in der Psychiatrie",
    author = "Katherine {John} and Carola {Kasperek}",
    year = "2022",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/1039456"
}