Die Donau Und Ihr Gebiet: Eine Geologische Skizze (1876)

Seven years ago, Jet, a half-demon with a violent temper and no remorse, lost his girlfriend, Jacquelyn. Now, he meets Amanda, a girl from the modern world who falls for the heartless creature, despite his numerous attempts to kill her until he discovers that she may be the key to solving the mysterious murder of Jacquelyn. Coming out of isolation for the first time in years, Jet and Amanda work together to solve the case, but things get nasty as the case begins taking new turns and they learn that everyone is a suspect.