The origins of the German "Krimi" crime dramas go back to Fritz Lang's DR.MABUSE DER SPIELER (1922) which itself owes a debt to the earlier French serials of Louis Feuillade such as FANTOMAS (1914). Lang followed the success of the first Mabuse film ten years later then revived the character in 1960 after his return to Germany - it was this film, DIE TAUSEND AUGEN DES DR.MABUSE and DER FROSCH MIT DER MASKE made a year earlier that really kicked off the "Krimi" as a distinct sub-genre.
I don't think anybody would claim that the krimis of the 1960's produced any masterpieces but they can be entertaining - a bit dull at times, maybe. There were a few c0-productions such as CIRCUS OF FEAR and TRAITOR'S GATE but the krimi remains a very Teutonic sub-genre. The inspirational Dr. Mabuse went of to inspire Claude Chabrol's DR. M (1990) and there has been a recent American remake, so far unseen in the UK. Evidence of the popularity of the character is witnessed by the fact that Gordon Hessler's unrelated SCREAM AND SCREAM AGAIN was released in Germany as DIE LEBENDEN LEICHEN DES DR.MABUSE. The 1937 film listed below managed to invoke both Edgar Wallace and Dr.Mabuse, not to mention Conan Doyle while, seemingly being unrelated to any. Films in my collection are:
DR.MABUSE DER SPIELER (1922) DAS TESTAMENT DES DR.MABUSE (1933) DER MAN DER SHERLOCK HOLMES WAS (1937) DER FROSCH MIT DER MASKE (1959) DIE TAUSEND AUGEN DES DR.MABUSE (1960) DER FALSCHER VON LONDON (1961) DIE IM STAHLNETZ DES DR.MABUSE (1961) DAS TESTAMENT DES DR.MABUSE (1962) UNSICHTBAREN KRALLEN DES DR. MABUSE (1962) SHERLOCK HOLMES UND DAS HALSBAND DES TODES (1962) DER HENKER VON LONDON (1963) DER GEHEIMNIS DER SCHWARZEN WITWE (1963) DIE WEISSE SPINNE (1963) DIE TODESSTRAHLEN DES DR.MABUSE (1964) DER UNHEIMLICHE MONCH (1965)