Colin McLaren - Rattus Rex ( Bellew Publishing Co Ltd or Rex Collings 1978)
This German edition Klett-Cotta 1984
In the 1860s London is plagued by attacks of well-disciplined rats. A young artist and a journalist go down in the sewers and discover the mastermind behind the attacks - which leads to allusions of Sherlock Holmes and Sumatra.
This seems to have become fairly obscure, also seems to be the only genre novel the author, an archival librarien in Aberdeen. According to Clute it was overshadowed by the continuing success of James Herbert. While it doesn't shirk on action, it is of course nowhere as violent as The Rats.
It's been ages I read this, but I have some fond memories. On the other hand, I like these Victorian tales, if they play by the rules, so I am easy to please in this. This German edition is nicely done, has some fine illustrations, got a hardcover and later this paperback edition and is long OOP.